Do not autofill element when there is no autofill suggestion from profile

components/autofill/core/browser/autofill_driver.h

 // Copyright 2013 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.
 
 #ifndef COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_DRIVER_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_DRIVER_H_
 
 #include <vector>
 
 #include "components/autofill/core/common/form_data.h"
@@ skipping 29 matching lines @@
   // (i.e., incognito) context.
   virtual bool IsOffTheRecord() const = 0;
 
   // Returns the URL request context information associated with this driver.
   virtual net::URLRequestContextGetter* GetURLRequestContext() = 0;
 
   // Returns the SequencedWorkerPool on which core Autofill code should run
   // tasks that may block. This pool must live at least as long as the driver.
   virtual base::SequencedWorkerPool* GetBlockingPool() = 0;
 
-  // Returns true iff the renderer is available for communication.
+  // Returns true if the renderer is available for communication.

[Ilya Sherman, 2014/06/02 23:51:00]

nit: "iff" was correct -- it stands for "if and only if"

   virtual bool RendererIsAvailable() = 0;
 
   // Forwards |data| to the renderer. |query_id| is the id of the renderer's
   // original request for the data. |action| is the action the renderer should
   // perform with the |data|. This method is a no-op if the renderer is not
   // currently available.
   virtual void SendFormDataToRenderer(int query_id,
                                       RendererFormDataAction action,
                                       const FormData& data) = 0;
 
@@ skipping 19 matching lines @@
 
   // Tells the renderer to preview the node with suggested text.
   virtual void RendererShouldPreviewFieldWithValue(
       const base::string16& value) = 0;
 
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_DRIVER_H_