Move c/r/extensions/* into extensions namespace

chrome/renderer/extensions/app_bindings.h

Index: chrome/renderer/extensions/app_bindings.h
diff --git a/chrome/renderer/extensions/app_bindings.h b/chrome/renderer/extensions/app_bindings.h
index 3e3c7810d7189148cf11b5df9230f105837fe242..2fff69ca1a35c63edb6509fab355436343091359 100644
--- a/chrome/renderer/extensions/app_bindings.h
+++ b/chrome/renderer/extensions/app_bindings.h
@@ -15,14 +15,16 @@
 #include "chrome/renderer/extensions/chrome_v8_extension.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
 
+namespace extensions {
 class ChromeV8Context;
 
 // Implements the chrome.app JavaScript object.
 //
 // TODO(aa): Add unit testing for this class.
-class AppBindings : public ChromeV8Extension, public ChromeV8ExtensionHandler {
+class AppBindings : public ChromeV8Extension,
+                    public ChromeV8ExtensionHandler {
  public:
-  explicit AppBindings(ExtensionDispatcher* dispatcher,
+  explicit AppBindings(Dispatcher* dispatcher,
                        ChromeV8Context* context);
 
  private:
@@ -47,4 +49,6 @@ class AppBindings : public ChromeV8Extension, public ChromeV8ExtensionHandler {
   DISALLOW_COPY_AND_ASSIGN(AppBindings);
 };
 
+}  // namespace extensions
+
 #endif  // CHROME_RENDERER_EXTENSIONS_APP_BINDINGS_H_