Eliminate //chrome dependencies from MetricsServicesManager

components/metrics/metrics_service_client.h

Index: components/metrics/metrics_service_client.h
diff --git a/components/metrics/metrics_service_client.h b/components/metrics/metrics_service_client.h
index 4cbebda48ce0bd332b501028a89a389ea7c3fdcf..0d542536bc371ab93c7402b3d0e0f9c14fb85289 100644
--- a/components/metrics/metrics_service_client.h
+++ b/components/metrics/metrics_service_client.h
@@ -15,6 +15,10 @@
 #include "base/time/time.h"
 #include "components/metrics/proto/system_profile.pb.h"
 
+namespace base {
+class FilePath;
+}
+
 namespace metrics {
 
 class MetricsLogUploader;
@@ -79,6 +83,9 @@ class MetricsServiceClient {
   // Returns the name of a key under HKEY_CURRENT_USER that can be used to store
   // backups of metrics data. Unused except on Windows.
   virtual base::string16 GetRegistryBackupKey();
+
+  // Called on plugin loading errors.
+  virtual void OnPluginLoadingError(const base::FilePath& plugin_path) {}
 };
 
 }  // namespace metrics