Create new histrograms for ExtensionPermission enum.

chrome/browser/extensions/navigation_observer.cc

Index: chrome/browser/extensions/navigation_observer.cc
diff --git a/chrome/browser/extensions/navigation_observer.cc b/chrome/browser/extensions/navigation_observer.cc
index 7fa60a6308b94436b67ff1fb3c9d15ea3e2ebca1..ac19ff628e5c5c8c26947889f3083a4cb9242040 100644
--- a/chrome/browser/extensions/navigation_observer.cc
+++ b/chrome/browser/extensions/navigation_observer.cc
@@ -112,9 +112,9 @@ void NavigationObserver::InstallUIAbort(bool user_initiated) {
   in_progress_prompt_navigation_controller_ = NULL;
   extension_install_prompt_.reset();
 
-  std::string histogram_name = user_initiated ?
-      "Extensions.Permissions_ReEnableCancel" :
-      "Extensions.Permissions_ReEnableAbort";
+  std::string histogram_name = user_initiated
+                                   ? "Extensions.Permissions_ReEnableCancel2"
+                                   : "Extensions.Permissions_ReEnableAbort2";
   ExtensionService::RecordPermissionMessagesHistogram(
       extension, histogram_name.c_str());
 }