Remove ChromeV8Extension & most of ChromeV8Context

chrome/renderer/extensions/media_galleries_custom_bindings.cc

Index: chrome/renderer/extensions/media_galleries_custom_bindings.cc
diff --git a/chrome/renderer/extensions/media_galleries_custom_bindings.cc b/chrome/renderer/extensions/media_galleries_custom_bindings.cc
index 72a1a46d6b1c2beed96fb61b20d7536bcb396b3b..f8e37123de6e3318802439a5bcec81209776f6da 100644
--- a/chrome/renderer/extensions/media_galleries_custom_bindings.cc
+++ b/chrome/renderer/extensions/media_galleries_custom_bindings.cc
@@ -6,7 +6,7 @@
 
 #include <string>
 
-#include "chrome/common/extensions/extension_constants.h"
+#include "extensions/renderer/script_context.h"
 #include "third_party/WebKit/public/web/WebDOMFileSystem.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
@@ -45,8 +45,8 @@ void GetMediaFileSystemObject(const v8::FunctionCallbackInfo<v8::Value>& args) {
 }  // namespace
 
 MediaGalleriesCustomBindings::MediaGalleriesCustomBindings(
-    Dispatcher* dispatcher, ChromeV8Context* context)
-    : ChromeV8Extension(dispatcher, context) {
+    ScriptContext* context)
+    : ObjectBackedNativeHandler(context) {
   RouteFunction("GetMediaFileSystemObject",
                 base::Bind(&GetMediaFileSystemObject));
 }