Add UMA stats for predicted process counts with out-of-process iframes.

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index 5f528b1c491377884b78673a405e88c1fea24d69..6951a1dbad50f2e616028d316d0e815f035dcb6b 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -156,12 +156,6 @@ class CONTENT_EXPORT RenderProcessHostImpl
                              BrowserContext* browser_context,
                              const GURL& site_url);
 
-  // Returns whether the process-per-site model is in use (globally or just for
-  // the current site), in which case we should ensure there is only one
-  // RenderProcessHost per site for the entire browser context.
-  static bool ShouldUseProcessPerSite(BrowserContext* browser_context,
-                                      const GURL& url);
-
   // Returns an existing RenderProcessHost for |url| in |browser_context|,
   // if one exists.  Otherwise a new RenderProcessHost should be created and
   // registered using RegisterProcessHostForSite().