Move SearchProvider implementation into Blink and make it a no-op.

chrome/renderer/external_extension.h

Index: chrome/renderer/external_extension.h
diff --git a/chrome/renderer/external_extension.h b/chrome/renderer/external_extension.h
deleted file mode 100644
index b5cb78b2284dbafb69b1787476552a0384cdf7fd..0000000000000000000000000000000000000000
--- a/chrome/renderer/external_extension.h
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright (c) 2009 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.
-
-// Implements the window.external object.
-
-#ifndef CHROME_RENDERER_EXTERNAL_EXTENSION_H_
-#define CHROME_RENDERER_EXTERNAL_EXTENSION_H_
-
-namespace v8 {
-class Extension;
-}
-
-namespace extensions_v8 {
-
-class ExternalExtension {
- public:
-  static v8::Extension* Get();
-};
-
-}  // namespace extensions_v8
-
-#endif  // CHROME_RENDERER_EXTERNAL_EXTENSION_H_