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

chrome/browser/extensions/api/feedback_private/feedback_private_api.cc

Index: chrome/browser/extensions/api/feedback_private/feedback_private_api.cc
diff --git a/chrome/browser/extensions/api/feedback_private/feedback_private_api.cc b/chrome/browser/extensions/api/feedback_private/feedback_private_api.cc
index bbbb7899609a52ec3284d4e819d3f430b91ddd0a..5cbc5654c26ace67572ab2488fde37777972a194 100644
--- a/chrome/browser/extensions/api/feedback_private/feedback_private_api.cc
+++ b/chrome/browser/extensions/api/feedback_private/feedback_private_api.cc
@@ -14,7 +14,6 @@
 #include "chrome/browser/feedback/tracing_manager.h"
 #include "chrome/browser/profiles/profile.h"
 #include "extensions/browser/event_router.h"
-#include "extensions/browser/extension_system.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/webui/web_ui_util.h"
@@ -69,8 +68,7 @@ void FeedbackPrivateAPI::RequestFeedback(
     const GURL& page_url) {
   // TODO(rkc): Remove logging once crbug.com/284662 is closed.
   LOG(WARNING) << "FEEDBACK_DEBUG: Feedback requested.";
-  if (browser_context_ &&
-      ExtensionSystem::Get(browser_context_)->event_router()) {
+  if (browser_context_ && EventRouter::Get(browser_context_)) {
     FeedbackInfo info;
     info.description = description_template;
     info.category_tag = make_scoped_ptr(new std::string(category_tag));
@@ -90,8 +88,7 @@ void FeedbackPrivateAPI::RequestFeedback(
 
     // TODO(rkc): Remove logging once crbug.com/284662 is closed.
     LOG(WARNING) << "FEEDBACK_DEBUG: Dispatching onFeedbackRequested event.";
-    ExtensionSystem::Get(browser_context_)
-        ->event_router()
+    EventRouter::Get(browser_context_)
         ->DispatchEventToExtension(kFeedbackExtensionId, event.Pass());
   }
 }