Fixed Task Manager FPS so that it shows 0 instead of 60 for background pages.

BUG=73206
TEST=manually


Review URL: http://codereview.chromium.org/8616004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111234 0039d316-1c4b-4281-b951-d872f2087c98

content/renderer/render_widget.cc

@@ -74,7 +74,7 @@ RenderWidget::RenderWidget(WebKit::WebPopupType popup_type)
       host_window_(0),
       current_paint_buf_(NULL),
       next_paint_flags_(0),
-      filtered_time_per_frame_(1.0f/60.0f),
+      filtered_time_per_frame_(0.0f),
       update_reply_pending_(false),
       using_asynchronous_swapbuffers_(false),
       num_swapbuffers_complete_pending_(0),