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 c437c662912a0c1b2c4f66a6a4eecd213411c3d5..a1dfe14e546ac13f40a06d1b946888f95a2aa3ff 100644
--- a/ui/android/window_android.cc
+++ b/ui/android/window_android.cc
@@ -17,7 +17,6 @@
 namespace ui {
 
 using base::android::AttachCurrentThread;
-using base::android::JavaRef;
 using base::android::ScopedJavaLocalRef;
 
 WindowAndroid::WindowAndroid(JNIEnv* env, jobject obj) : compositor_(NULL) {
@@ -144,16 +143,6 @@ 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);