Clean up the 'js' build tags

Updates #1129

ebitenutil/file_js.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build js
-
 package ebitenutil
 
 import (

examples/contextlost/main_js.go

@@ -12,7 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build js
 // +build example
 
 package main

genkeys.go

@@ -684,7 +684,7 @@ func main() {
 		filepath.Join("internal", "glfw", "keys.go"):                   glfwKeysTmpl,
 		filepath.Join("internal", "uidriver", "glfw", "keys.go"):       uidriverGlfwKeysTmpl,
 		filepath.Join("internal", "uidriver", "mobile", "keys.go"):     mobileGBuildKeysTmpl,
-		filepath.Join("internal", "uidriver", "js", "keys.go"):         uidriverJsKeysTmpl,
+		filepath.Join("internal", "uidriver", "js", "keys_js.go"):      uidriverJsKeysTmpl,
 		filepath.Join("keys.go"):                                       ebitenKeysTmpl,
 		filepath.Join("mobile", "ebitenmobileview", "keys_android.go"): mobileAndroidKeysTmpl,
 	} {
@@ -711,8 +711,6 @@ func main() {
 				"\n// +build !js" +
 				"\n// +build !android" +
 				"\n// +build !ios"
-		case "internal/uidriver/js/keys.go":
-			buildTag = "// +build js"
 		}
 		// NOTE: According to godoc, maps are automatically sorted by key.
 		if err := tmpl.Execute(f, struct {

internal/devicescale/impl_js.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build js
-
 package devicescale
 
 import (

internal/devicescale/impl_plan9.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build !js
-
 package devicescale
 
 func impl(x, y int) float64 {

internal/devicescale/impl_windows.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build !js
-
 package devicescale
 
 import (

internal/graphicsdriver/opengl/context_js.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build js
-
 package opengl
 
 import (

internal/jsutil/go112_js.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build !go1.13 !wasm
+// +build !go1.13
 
 package jsutil
 

internal/jsutil/jsutil_js_test.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build js
-
 package jsutil_test
 
 import (

internal/restorable/const_js.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build js
-
 package restorable
 
 // needsDisposingWhenRestoring reports whether disposing resources is necessary or not when restoring.

internal/testflock/flock_js.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build js
-
 package testflock
 
 import (

internal/uidriver/glfw/graphics_darwin.go

@@ -12,7 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build !js
 // +build !ebitengl
 
 package glfw

internal/uidriver/glfw/hideconsole_windows.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build !js
-
 package glfw
 
 import (

internal/uidriver/glfw/ui_darwin.go

@@ -12,7 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build !js
 // +build !ios
 
 package glfw

internal/uidriver/glfw/ui_windows.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build !js
-
 package glfw
 
 import (

internal/uidriver/js/input_js.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build js
-
 package js
 
 import (

internal/uidriver/js/keys_js.go

@@ -14,8 +14,6 @@
 
 // Code generated by genkeys.go using 'go generate'. DO NOT EDIT.
 
-// +build js
-
 package js
 
 import (

internal/uidriver/js/ui_js.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build js
-
 package js
 
 import (

internal/web/web_js.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build js
-
 package web
 
 import (

uidriver_js.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build js
-
 package ebiten
 
 import (