[Android] Use WebContents text manipulation methods directly

content/browser/renderer_host/ime_adapter_android.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_IME_ADAPTER_ANDROID_H_
 #define CONTENT_BROWSER_RENDERER_HOST_IME_ADAPTER_ANDROID_H_
 
 #include <jni.h>
 
 #include "base/android/jni_weak_ref.h"
@@ skipping 36 matching lines @@
                         jobject obj,
                         jobject text,
                         jstring text_str,
                         int new_cursor_pos);
   void CommitText(JNIEnv*, jobject, jstring text_str);
   void FinishComposingText(JNIEnv* env, jobject);
   void AttachImeAdapter(JNIEnv*, jobject java_object);
   void SetEditableSelectionOffsets(JNIEnv*, jobject, int start, int end);
   void SetComposingRegion(JNIEnv*, jobject, int start, int end);
   void DeleteSurroundingText(JNIEnv*, jobject, int before, int after);
-  void Unselect(JNIEnv*, jobject);
-  void SelectAll(JNIEnv*, jobject);
-  void Cut(JNIEnv*, jobject);
-  void Copy(JNIEnv*, jobject);
-  void Paste(JNIEnv*, jobject);
   void ResetImeAdapter(JNIEnv*, jobject);
 
   // Called from native -> java
   void CancelComposition();
   void FocusedNodeChanged(bool is_editable_node);
 
  private:
   RenderWidgetHostImpl* GetRenderWidgetHostImpl();
   RenderFrameHost* GetFocusedFrame();
   WebContents* GetWebContents();
 
   RenderWidgetHostViewAndroid* rwhva_;
   JavaObjectWeakGlobalRef java_ime_adapter_;
 };
 
 bool RegisterImeAdapter(JNIEnv* env);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_IME_ADAPTER_ANDROID_H_