[WebView] Fix issue with transparent background.

android_webview/native/aw_contents.cc

Index: android_webview/native/aw_contents.cc
diff --git a/android_webview/native/aw_contents.cc b/android_webview/native/aw_contents.cc
index f5336e0d7c6279c5c4591e88c59f4852d4b48e7a..10bbb18cca1d87133e2f234ec70994c7e555ef7d 100644
--- a/android_webview/native/aw_contents.cc
+++ b/android_webview/native/aw_contents.cc
@@ -976,12 +976,6 @@ void AwContents::SetBackgroundColor(JNIEnv* env, jobject obj, jint color) {
   render_view_host_ext_->SetBackgroundColor(color);
 }
 
-void AwContents::SetHasTransparentBackground(
-    JNIEnv* env, jobject obj, bool transparent) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  browser_view_renderer_.SetHasTransparentBackground(transparent);
-}
-
 jlong AwContents::ReleasePopupAwContents(JNIEnv* env, jobject obj) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   return reinterpret_cast<intptr_t>(pending_contents_.release());