Factor out ContentViewAndroidDelegate

ui/android/java/src/org/chromium/ui/base/WindowAndroid.java

Index: ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
diff --git a/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java b/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
index 5d3d91326cd701a75dfa41a8b462b70004fbc8b8..a848f2882d8d5b3649a9bdb1addea033ca7fe8d8 100644
--- a/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
+++ b/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
@@ -15,7 +15,6 @@ import android.content.Context;
 import android.content.ContextWrapper;
 import android.content.Intent;
 import android.content.pm.PackageManager;
-import android.graphics.Bitmap;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Process;
@@ -652,15 +651,6 @@ public class WindowAndroid {
         }
     }
 
-    /**
-     * Starts drag and drop operation on a ViewAndroid whose delegate is viewAndroidDelegate.
-     */
-    @CalledByNative
-    private void startDragAndDrop(
-            ViewAndroidDelegate viewAndroidDelegate, String text, Bitmap shadowImage) {
-        viewAndroidDelegate.startDragAndDrop(text, shadowImage);
-    }
-
     private native long nativeInit();
     private native void nativeOnVSync(long nativeWindowAndroid,
                                       long vsyncTimeMicros,