Treat PPAPI disconnect as a crash for plugin metrics.

chrome/browser/metrics/plugin_metrics_provider.h

 // 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.
 
 #ifndef CHROME_BROWSER_METRICS_PLUGIN_METRICS_PROVIDER_H_
 #define CHROME_BROWSER_METRICS_PLUGIN_METRICS_PROVIDER_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 76 matching lines @@
   // RecordCurrentState immediately and returns true. Otherwise returns false.
   bool RecordCurrentStateIfPending();
 
   // content::BrowserChildProcessObserver:
   void BrowserChildProcessHostConnected(
       const content::ChildProcessData& data) override;
   void BrowserChildProcessCrashed(const content::ChildProcessData& data,
                                   int exit_code) override;
   void BrowserChildProcessInstanceCreated(
       const content::ChildProcessData& data) override;
+  void BrowserChildProcessHostDisconnected(
+      const content::ChildProcessData& data) override;
 
   PrefService* local_state_;
 
   // The list of plugins which was retrieved on the file thread.
   std::vector<content::WebPluginInfo> plugins_;
 
   // Buffer of child process notifications for quick access.
   std::map<base::string16, ChildProcessStats> child_process_stats_buffer_;
 
   base::WeakPtrFactory<PluginMetricsProvider> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginMetricsProvider);
 };
 
 #endif  // CHROME_BROWSER_METRICS_PLUGIN_METRICS_PROVIDER_H_