Remove all the unnused automation IPCs. These were used by UI tests that have been converted to bro…

chrome/browser/automation/automation_tab_tracker.h

Index: chrome/browser/automation/automation_tab_tracker.h
===================================================================
--- chrome/browser/automation/automation_tab_tracker.h	(revision 137438)
+++ chrome/browser/automation/automation_tab_tracker.h	(working copy)
@@ -28,12 +28,7 @@
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details);
 
-  base::Time GetLastNavigationTime(int handle);
-
  private:
-  // Last time a navigation occurred.
-  std::map<content::NavigationController*, base::Time> last_navigation_times_;
-
   DISALLOW_COPY_AND_ASSIGN(AutomationTabTracker);
 };