Revert of [Extensions] Don't count bubble dismissal from focus loss as acknowledgment

chrome/browser/extensions/settings_api_bubble_delegate.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/settings_api_bubble_delegate.h"
 
 #include "base/metrics/histogram.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/settings_api_helpers.h"
@@ skipping 220 matching lines @@
       break;
     case BUBBLE_TYPE_SEARCH_ENGINE:
       UMA_HISTOGRAM_ENUMERATION(
           "ExtensionOverrideBubble.SettingsApiUserSelectionSearchEngine",
           action,
           ExtensionMessageBubbleController::ACTION_BOUNDARY);
       break;
   }
 }
 
-const char* SettingsApiBubbleDelegate::GetKey() {
-  switch (type_) {
-    case BUBBLE_TYPE_HOME_PAGE:
-      return "SettingsApiBubbleDelegate.HomePage";
-    case BUBBLE_TYPE_STARTUP_PAGES:
-      return "SettingsApiBubbleDelegate.StartupPages";
-    case BUBBLE_TYPE_SEARCH_ENGINE:
-      return "SettingsApiBubbleDelegate.SearchEngine";
-  }
-  NOTREACHED();
-  return "";
-}
-
 }  // namespace extensions