Remove dependency from content_renderer on startup_metric_utils_common.

chrome/renderer/chrome_content_renderer_client.h

Index: chrome/renderer/chrome_content_renderer_client.h
diff --git a/chrome/renderer/chrome_content_renderer_client.h b/chrome/renderer/chrome_content_renderer_client.h
index b3c1a4810c056efd0a8f5fe81192e6761cd75f9c..a347e77fb49ba449dd2d37bfe35c0e4296a34b4d 100644
--- a/chrome/renderer/chrome_content_renderer_client.h
+++ b/chrome/renderer/chrome_content_renderer_client.h
@@ -79,6 +79,7 @@ class ChromeContentRendererClient : public content::ContentRendererClient {
   ChromeContentRendererClient();
   ~ChromeContentRendererClient() override;
 
+  void RendererMainEntered() override;
   void RenderThreadStarted() override;
   void RenderFrameCreated(content::RenderFrame* render_frame) override;
   void RenderViewCreated(content::RenderView* render_view) override;
@@ -185,6 +186,9 @@ class ChromeContentRendererClient : public content::ContentRendererClient {
   static GURL GetNaClContentHandlerURL(const std::string& actual_mime_type,
                                        const content::WebPluginInfo& plugin);
 
+  // Time at which the RendererMain function was entered.
+  base::TimeTicks renderer_main_entry_time_;
+
 #if !defined(DISABLE_NACL)
   // Determines if a NaCl app is allowed, and modifies params to pass the app's
   // permissions to the trusted NaCl plugin.