Move notifications used only in chrome/ out of content/.

chrome/browser/automation/automation_tab_tracker.cc

Index: chrome/browser/automation/automation_tab_tracker.cc
diff --git a/chrome/browser/automation/automation_tab_tracker.cc b/chrome/browser/automation/automation_tab_tracker.cc
index 7f7e2ccc3e42f0e84adc167ee7811deb6c821005..4f253223c0cd2cf5ff5a1e4334f244ba286d6fe2 100644
--- a/chrome/browser/automation/automation_tab_tracker.cc
+++ b/chrome/browser/automation/automation_tab_tracker.cc
@@ -20,7 +20,7 @@ AutomationTabTracker::~AutomationTabTracker() {
 void AutomationTabTracker::AddObserver(NavigationController* resource) {
   // This tab could either be a regular tab or an external tab
   // Register for both notifications.
-  registrar_.Add(this, content::NOTIFICATION_TAB_CLOSING,
+  registrar_.Add(this, chrome::NOTIFICATION_TAB_CLOSING,
                  content::Source<NavigationController>(resource));
   registrar_.Add(this, chrome::NOTIFICATION_EXTERNAL_TAB_CLOSED,
                  content::Source<NavigationController>(resource));
@@ -31,7 +31,7 @@ void AutomationTabTracker::AddObserver(NavigationController* resource) {
 }
 
 void AutomationTabTracker::RemoveObserver(NavigationController* resource) {
-  registrar_.Remove(this, content::NOTIFICATION_TAB_CLOSING,
+  registrar_.Remove(this, chrome::NOTIFICATION_TAB_CLOSING,
                     content::Source<NavigationController>(resource));
   registrar_.Remove(this, chrome::NOTIFICATION_EXTERNAL_TAB_CLOSED,
                     content::Source<NavigationController>(resource));
@@ -50,7 +50,7 @@ void AutomationTabTracker::Observe(
               base::Time::Now();
       return;
     case chrome::NOTIFICATION_EXTERNAL_TAB_CLOSED:
-    case content::NOTIFICATION_TAB_CLOSING:
+    case chrome::NOTIFICATION_TAB_CLOSING:
       {
         std::map<NavigationController*, base::Time>::iterator iter =
             last_navigation_times_.find(