Move ExtensionEventRouter and related into extensions namespace

chrome/browser/io_thread.h

Index: chrome/browser/io_thread.h
diff --git a/chrome/browser/io_thread.h b/chrome/browser/io_thread.h
index 7e04ceb737939625a809da45e944580b47df7a7d..e4e4faf420f35ab64e0cf23b2e318ef324da1159 100644
--- a/chrome/browser/io_thread.h
+++ b/chrome/browser/io_thread.h
@@ -19,7 +19,6 @@
 #include "net/base/network_change_notifier.h"
 
 class ChromeNetLog;
-class ExtensionEventRouterForwarder;
 class PrefProxyConfigTrackerImpl;
 class PrefService;
 class SystemURLRequestContextGetter;
@@ -28,6 +27,10 @@ namespace chrome_browser_net {
 class HttpPipeliningCompatibilityClient;
 }
 
+namespace extensions {
+class EventRouterForwarder;
+}
+
 namespace net {
 class CertVerifier;
 class CookieStore;
@@ -104,7 +107,7 @@ class IOThread : public content::BrowserThreadDelegate {
     // between |proxy_script_fetcher_context| and |system_request_context|.
     scoped_refptr<net::CookieStore> system_cookie_store;
     scoped_ptr<net::ServerBoundCertService> system_server_bound_cert_service;
-    scoped_refptr<ExtensionEventRouterForwarder>
+    scoped_refptr<extensions::EventRouterForwarder>
         extension_event_router_forwarder;
     scoped_ptr<chrome_browser_net::HttpPipeliningCompatibilityClient>
         http_pipelining_compatibility_client;
@@ -113,7 +116,7 @@ class IOThread : public content::BrowserThreadDelegate {
   // |net_log| must either outlive the IOThread or be NULL.
   IOThread(PrefService* local_state,
            ChromeNetLog* net_log,
-           ExtensionEventRouterForwarder* extension_event_router_forwarder);
+           extensions::EventRouterForwarder* extension_event_router_forwarder);
 
   virtual ~IOThread();
 
@@ -168,9 +171,9 @@ class IOThread : public content::BrowserThreadDelegate {
   // threads during shutdown, but is used most frequently on the IOThread.
   ChromeNetLog* net_log_;
 
-  // The ExtensionEventRouterForwarder allows for sending events to extensions
-  // from the IOThread.
-  ExtensionEventRouterForwarder* extension_event_router_forwarder_;
+  // The extensions::EventRouterForwarder allows for sending events to
+  // extensions from the IOThread.
+  extensions::EventRouterForwarder* extension_event_router_forwarder_;
 
   // These member variables are basically global, but their lifetimes are tied
   // to the IOThread.  IOThread owns them all, despite not using scoped_ptr.