Split web_view_internal_api and move part of it to extensions.

extensions/renderer/resources/web_view_internal.js

Index: extensions/renderer/resources/web_view_internal.js
diff --git a/chrome/browser/bitmap_fetcher.h b/extensions/renderer/resources/web_view_internal.js
similarity index 65%
copy from chrome/browser/bitmap_fetcher.h
copy to extensions/renderer/resources/web_view_internal.js
index ae271fecf7bc74f051c511133d2730d41156cb15..1c91f5b421d99f50e5e20e4cfe771635a05262c8 100644
--- a/chrome/browser/bitmap_fetcher.h
+++ b/extensions/renderer/resources/web_view_internal.js
@@ -2,4 +2,5 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/bitmap_fetcher/bitmap_fetcher.h"
+exports.WebView =
+    require('binding').Binding.create('webViewInternal').generate();