Remove dependency from content_renderer on startup_metric_utils_common.

content/public/renderer/content_renderer_client.h

Index: content/public/renderer/content_renderer_client.h
diff --git a/content/public/renderer/content_renderer_client.h b/content/public/renderer/content_renderer_client.h
index 45686b56691dcf5aeb668d28b8e3dbbedef9d21a..e2c8cf2477805fbf105da0e462d89b5ff2fc6aef 100644
--- a/content/public/renderer/content_renderer_client.h
+++ b/content/public/renderer/content_renderer_client.h
@@ -77,6 +77,9 @@ class CONTENT_EXPORT ContentRendererClient {
  public:
   virtual ~ContentRendererClient() {}
 
+  // Notifies that the RendererMain function has been entered.
+  virtual void RendererMainEntered() {}
+
   // Notifies us that the RenderThread has been created.
   virtual void RenderThreadStarted() {}