Plugin Power Saver: Record PPS UMAs only for users with PPS enabled.

chrome/renderer/chrome_content_renderer_client.cc

 // 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.
 
 #include "chrome/renderer/chrome_content_renderer_client.h"
 
 #include "base/command_line.h"
 #include "base/debug/crash_logging.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
@@ skipping 872 matching lines @@
               l10n_util::GetStringFUTF16(IDS_PLUGIN_BLOCKED, group_name),
               poster_attribute, frame->document().url());
           placeholder->set_blocked_for_background_tab(
               blocked_for_background_tab);
           placeholder->set_blocked_for_prerendering(is_prerendering);
           placeholder->set_power_saver_enabled(power_saver_enabled);
           placeholder->set_allow_loading(true);
           break;
         }
 
-        scoped_ptr<content::PluginInstanceThrottler> throttler =
-            PluginInstanceThrottler::Create(power_saver_enabled);
+        scoped_ptr<content::PluginInstanceThrottler> throttler;
         if (power_saver_enabled) {
+          throttler = PluginInstanceThrottler::Create();
           // PluginPreroller manages its own lifetime.
           new PluginPreroller(
               render_frame, frame, params, info, identifier, group_name,
               l10n_util::GetStringFUTF16(IDS_PLUGIN_BLOCKED, group_name),
               throttler.get());
         }
 
         return render_frame->CreatePlugin(frame, info, params,
                                           throttler.Pass());
 #else   // !defined(ENABLE_PLUGINS)
@@ skipping 735 matching lines @@
   if (mime_type == content::kBrowserPluginMimeType) {
     return new extensions::ExtensionsGuestViewContainer(render_frame);
   } else {
     return new extensions::MimeHandlerViewContainer(
         render_frame, mime_type, original_url);
   }
 #else
   return NULL;
 #endif
 }