Move c/r/extensions/* into extensions namespace

chrome/renderer/extensions/chrome_v8_extension_handler.cc

Index: chrome/renderer/extensions/chrome_v8_extension_handler.cc
diff --git a/chrome/renderer/extensions/chrome_v8_extension_handler.cc b/chrome/renderer/extensions/chrome_v8_extension_handler.cc
index 55587653e2ce002dbbc6a18bc5afc6da403911e3..eaa8a2f1129adaf252a82d6ef025c04f28bc177a 100644
--- a/chrome/renderer/extensions/chrome_v8_extension_handler.cc
+++ b/chrome/renderer/extensions/chrome_v8_extension_handler.cc
@@ -10,6 +10,8 @@
 
 using content::RenderThread;
 
+namespace extensions {
+
 ChromeV8ExtensionHandler::ChromeV8ExtensionHandler(ChromeV8Context* context)
     : context_(context), routing_id_(MSG_ROUTING_NONE) {
 }
@@ -31,3 +33,5 @@ int ChromeV8ExtensionHandler::GetRoutingID() {
 void ChromeV8ExtensionHandler::Send(IPC::Message* message) {
   RenderThread::Get()->Send(message);
 }
+
+}  // namespace extensions