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This CL eliminates MetricsService's call to
PluginMetricsProvider::RecordPluginChanges (replaced by a new API on
MetricsProvider). It additionally adds a
MetricsServicesManager::OnPluginLoadingError() API and has the plugin observer
call that API rather than calling MetricsService directly. This change will
enable easily moving MetricsService::LogPluginLoadingError() to
ChromeMetricsServiceClient once the latter is the class that keeps a weak
pointer to the plugin metrics provider.

BUG=375776

Review URL: https://codereview.chromium.org/308433004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274403 0039d316-1c4b-4281-b951-d872f2087c98