Move Extension into extensions namespace

chrome/renderer/extensions/chrome_v8_extension.h

Index: chrome/renderer/extensions/chrome_v8_extension.h
diff --git a/chrome/renderer/extensions/chrome_v8_extension.h b/chrome/renderer/extensions/chrome_v8_extension.h
index 84fda03ddcbd84a78d5d2fd913834e83a226aa33..4be658727b632d0ad9d15f2fa11f462c88eca406 100644
--- a/chrome/renderer/extensions/chrome_v8_extension.h
+++ b/chrome/renderer/extensions/chrome_v8_extension.h
@@ -18,13 +18,16 @@
 #include <string>
 
 class ChromeV8Context;
-class Extension;
 class ExtensionDispatcher;
 
 namespace content {
 class RenderView;
 }
 
+namespace extensions {
+class Extension;
+}
+
 // This is a base class for chrome extension bindings.  Common features that
 // are shared by different modules go here.
 // TODO(koz): Rename this to ExtensionNativeModule.
@@ -52,7 +55,7 @@ class ChromeV8Extension : public NativeHandler {
   // Note: do not call this function before or during the chromeHidden.onLoad
   // event dispatch. The URL might not have been committed yet and might not
   // be an extension URL.
-  const ::Extension* GetExtensionForCurrentRenderView() const;
+  const extensions::Extension* GetExtensionForCurrentRenderView() const;
 
   // Returns the chromeHidden object for the current context.
   static v8::Handle<v8::Value> GetChromeHidden(const v8::Arguments& args);