Fix client-side phishing detection test flakiness and ChromeOS failure.

content/renderer/renderer_webkitplatformsupport_impl.h

Index: content/renderer/renderer_webkitplatformsupport_impl.h
diff --git a/content/renderer/renderer_webkitplatformsupport_impl.h b/content/renderer/renderer_webkitplatformsupport_impl.h
index f125b0957326c6f10cdb63aee9b6994058bc7b45..413290928f5cb8f6ca7ed8446adfb51a0bb7d973 100644
--- a/content/renderer/renderer_webkitplatformsupport_impl.h
+++ b/content/renderer/renderer_webkitplatformsupport_impl.h
@@ -92,6 +92,15 @@ class CONTENT_EXPORT RendererWebKitPlatformSupportImpl
   virtual WebKit::WebMediaStreamCenter* createMediaStreamCenter(
       WebKit::WebMediaStreamCenterClient* client) OVERRIDE;
 
+  // Disables the WebSandboxSupport implementation for testing.
+  // Tests that do not set up a full sandbox environment should call
+  // SetSandboxEnabledForTesting(false) _before_ creating any instances
+  // of this class, to ensure that we don't attempt to use sandbox-related
+  // file descriptors or other resources.
+  //
+  // Returns the previous |enable| value.
+  static bool SetSandboxEnabledForTesting(bool enable);
+
  protected:
   virtual GpuChannelHostFactory* GetGpuChannelHostFactory() OVERRIDE;