Report PPAPI plugin load error code to UMA.

content/child/npapi/plugin_lib.cc

 // Copyright (c) 2011 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 "content/child/npapi/plugin_lib.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/stats_counters.h"
@@ skipping 153 matching lines @@
   if ((instance_count_ == 0) && !defer_unload_)
     Unload();
 }
 
 bool PluginLib::Load() {
   if (library_)
     return true;
 
   bool rv = false;
   base::NativeLibrary library = 0;
-  std::string error;
+  base::NativeLibraryLoadError error = 0;
 
 #if defined(OS_WIN)
   // This is to work around a bug in the Real player recorder plugin which
   // intercepts LoadLibrary calls from chrome.dll and wraps NPAPI functions
   // provided by the plugin. It crashes if the media player plugin is being
   // loaded. Workaround is to load the dll dynamically by getting the
   // LoadLibrary API address from kernel32.dll which bypasses the recorder
   // plugin.
   if (web_plugin_info_.name.find(L"Windows Media Player") !=
       std::wstring::npos) {
@@ skipping 143 matching lines @@
 }
 
 void PluginLib::Shutdown() {
   if (initialized_) {
     NP_Shutdown();
     initialized_ = false;
   }
 }
 
 }  // namespace content