Factor out ContentViewAndroidDelegate

ui/android/window_android.cc

Index: ui/android/window_android.cc
diff --git a/ui/android/window_android.cc b/ui/android/window_android.cc
index 5aa9e4006afd788464e2f78025bdb9121a81ce5f..403ca0b397bac4c35cfa69051d28a09dc2e33df6 100644
--- a/ui/android/window_android.cc
+++ b/ui/android/window_android.cc
@@ -18,7 +18,6 @@ namespace ui {
 
 using base::android::AttachCurrentThread;
 using base::android::JavaParamRef;
-using base::android::JavaRef;
 using base::android::ScopedJavaLocalRef;
 
 WindowAndroid::WindowAndroid(JNIEnv* env, jobject obj) : compositor_(NULL) {
@@ -145,16 +144,6 @@ bool WindowAndroid::CanRequestPermission(const std::string& permission) {
       base::android::ConvertUTF8ToJavaString(env, permission).obj());
 }
 
-void WindowAndroid::StartDragAndDrop(
-    const JavaRef<jobject>& jview_android_delegate,
-    const JavaRef<jstring>& jtext,
-    const JavaRef<jobject>& jimage) {
-  JNIEnv* env = AttachCurrentThread();
-  Java_WindowAndroid_startDragAndDrop(env, GetJavaObject().obj(),
-                                      jview_android_delegate.obj(), jtext.obj(),
-                                      jimage.obj());
-}
-
 WindowAndroid* WindowAndroid::GetWindowAndroid() const {
   DCHECK(parent_ == nullptr);
   return const_cast<WindowAndroid*>(this);