cleanup: Use EventRouter instead of ExtensionSystem::Get->event_router()

chrome/browser/extensions/api/processes/processes_api.cc

Index: chrome/browser/extensions/api/processes/processes_api.cc
diff --git a/chrome/browser/extensions/api/processes/processes_api.cc b/chrome/browser/extensions/api/processes/processes_api.cc
index 852a64c46ea7ae38737ab1c480581c3fb413e6f8..70bc204131a1ec52cb9b359621b217d6be9e34a9 100644
--- a/chrome/browser/extensions/api/processes/processes_api.cc
+++ b/chrome/browser/extensions/api/processes/processes_api.cc
@@ -34,7 +34,6 @@
 #include "extensions/browser/event_router.h"
 #include "extensions/browser/extension_function_registry.h"
 #include "extensions/browser/extension_function_util.h"
-#include "extensions/browser/extension_system.h"
 #include "extensions/common/error_utils.h"
 
 namespace extensions {
@@ -470,29 +469,25 @@ void ProcessesEventRouter::ProcessClosedEvent(
 void ProcessesEventRouter::DispatchEvent(
     const std::string& event_name,
     scoped_ptr<base::ListValue> event_args) {
-  if (extensions::ExtensionSystem::Get(browser_context_)->event_router()) {
+  EventRouter* event_router = EventRouter::Get(browser_context_);
+  if (event_router) {
     scoped_ptr<extensions::Event> event(new extensions::Event(
         event_name, event_args.Pass()));
-    extensions::ExtensionSystem::Get(browser_context_)
-        ->event_router()
-        ->BroadcastEvent(event.Pass());
+    event_router->BroadcastEvent(event.Pass());
   }
 }
 
 bool ProcessesEventRouter::HasEventListeners(const std::string& event_name) {
-  extensions::EventRouter* router =
-      extensions::ExtensionSystem::Get(browser_context_)->event_router();
-  if (router && router->HasEventListener(event_name))
-    return true;
-  return false;
+  EventRouter* event_router = EventRouter::Get(browser_context_);
+  return event_router && event_router->HasEventListener(event_name);
 }
 
 ProcessesAPI::ProcessesAPI(content::BrowserContext* context)
     : browser_context_(context) {
-  ExtensionSystem::Get(browser_context_)->event_router()->RegisterObserver(
-      this, processes_api_constants::kOnUpdated);
-  ExtensionSystem::Get(browser_context_)->event_router()->RegisterObserver(
-      this, processes_api_constants::kOnUpdatedWithMemory);
+  EventRouter* event_router = EventRouter::Get(browser_context_);
+  event_router->RegisterObserver(this, processes_api_constants::kOnUpdated);
+  event_router->RegisterObserver(this,
+                                 processes_api_constants::kOnUpdatedWithMemory);
   ExtensionFunctionRegistry* registry =
       ExtensionFunctionRegistry::GetInstance();
   registry->RegisterFunction<extensions::GetProcessIdForTabFunction>();
@@ -504,8 +499,7 @@ ProcessesAPI::~ProcessesAPI() {
 }
 
 void ProcessesAPI::Shutdown() {
-  ExtensionSystem::Get(browser_context_)->event_router()->UnregisterObserver(
-      this);
+  EventRouter::Get(browser_context_)->UnregisterObserver(this);
 }
 
 static base::LazyInstance<BrowserContextKeyedAPIFactory<ProcessesAPI> >