Fix RenderFrameProxyHost leak.

content/browser/site_per_process_browsertest.h

 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <string>
+
 #include "content/public/test/content_browser_test.h"
 #include "url/gurl.h"
 
 namespace content {
 
+class FrameTreeNode;
 class Shell;
 
 class SitePerProcessBrowserTest : public ContentBrowserTest {
  public:
   SitePerProcessBrowserTest();
 
+  // Returns an alphabetically-sorted list of the site instance URLs

[Charlie Reis, 2015/04/09 16:58:08]

nit:s/site instance URLs/SiteInstance site URLs/
Also mention that they're one per line (since one might expect this to return a
list of strings).

+  // in which RenderFrameProxyHosts of |node| currently exist.
+  // TODO(nick): Make this a full-fledged tree walk.
+  static std::string DumpProxyHostSiteInstances(FrameTreeNode* node);
+
  protected:
   // Start at a data URL so each extra navigation creates a navigation entry.
   // (The first navigation will silently be classified as AUTO_SUBFRAME.)
   // TODO(creis): This won't be necessary when we can wait for LOAD_STOP.
   void StartFrameAtDataURL();
 
   void SetUpCommandLine(base::CommandLine* command_line) override;
   void SetUpOnMainThread() override;
 };
 
 }  // namespace content