Remove VIEW_TYPE_NOTIFICATION since it's not used anymore.

chrome/browser/memory_details.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_MEMORY_DETAILS_H_
 #define CHROME_BROWSER_MEMORY_DETAILS_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/process/process_metrics.h"
 #include "base/strings/string16.h"
 #include "chrome/browser/site_details.h"
 #include "content/public/common/process_type.h"
 
 // We collect data about each browser process.  A browser may
 // have multiple processes (of course!).  Even IE has multiple
 // processes these days.
 struct ProcessMemoryInformation {
   // NOTE: Do not remove or reorder the elements in this enum, and only add new
   // items at the end. We depend on these specific values in a histogram.
   enum RendererProcessType {
     RENDERER_UNKNOWN = 0,
     RENDERER_NORMAL,
     RENDERER_CHROME,        // WebUI (chrome:// URL)
     RENDERER_EXTENSION,     // chrome-extension://
     RENDERER_DEVTOOLS,      // Web inspector
     RENDERER_INTERSTITIAL,  // malware/phishing interstitial
-    RENDERER_NOTIFICATION,  // HTML notification bubble
     RENDERER_BACKGROUND_APP // hosted app background page
   };
 
   static std::string GetRendererTypeNameInEnglish(RendererProcessType type);
   static std::string GetFullTypeNameInEnglish(
       int process_type,
       RendererProcessType rtype);
 
   ProcessMemoryInformation();
   ~ProcessMemoryInformation();
@@ skipping 148 matching lines @@
   UserMetricsMode user_metrics_mode_;
 
 #if defined(OS_CHROMEOS)
   base::SwapInfo swap_info_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(MemoryDetails);
 };
 
 #endif  // CHROME_BROWSER_MEMORY_DETAILS_H_