Template methods on Timer classes instead of the classes themselves.

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index b09df57f599261b7925350fbf68477383fafe09b..67ca23cf073341520655ffe7a0a2b1cd799af2eb 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -547,7 +547,7 @@ class CONTENT_EXPORT RenderThreadImpl
   bool layout_test_mode_;
 
   // Timer that periodically calls IdleHandler.
-  base::RepeatingTimer<RenderThreadImpl> idle_timer_;
+  base::RepeatingTimer idle_timer_;
 
   // The channel from the renderer process to the GPU process.
   scoped_refptr<GpuChannelHost> gpu_channel_;