Move ExtensionEventRouter and related into extensions namespace

chrome/browser/browser_process.h

Index: chrome/browser/browser_process.h
diff --git a/chrome/browser/browser_process.h b/chrome/browser/browser_process.h
index 42d8f01a44af42d653a47a06197365a383841286..fee9cbd23162cc989ba5bb700dbe458b8fe35809 100644
--- a/chrome/browser/browser_process.h
+++ b/chrome/browser/browser_process.h
@@ -21,7 +21,6 @@ class CRLSetFetcher;
 class ComponentUpdateService;
 class DownloadRequestLimiter;
 class DownloadStatusUpdater;
-class ExtensionEventRouterForwarder;
 class IconManager;
 class IntranetRedirectDetector;
 class IOThread;
@@ -45,6 +44,10 @@ namespace chrome_variations {
 class VariationsService;
 }
 
+namespace extensions {
+class EventRouterForwarder;
+}
+
 namespace net {
 class URLRequestContextGetter;
 }
@@ -101,7 +104,7 @@ class BrowserProcess {
   virtual chromeos::OomPriorityManager* oom_priority_manager() = 0;
 #endif  // defined(OS_CHROMEOS)
 
-  virtual ExtensionEventRouterForwarder*
+  virtual extensions::EventRouterForwarder*
       extension_event_router_forwarder() = 0;
 
   // Returns the manager for desktop notifications.