[Autofill] Respect the autocomplete=off attribute.

components/autofill/core/common/autofill_util.cc

 // Copyright 2015 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 "components/autofill/core/common/autofill_util.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 78 matching lines @@
       // Returns the character position right after the |field_contents| within
       // |suggestion| text as a caret position for text selection.
       return it - suggestion.begin() + field_contents.size();
     }
   }
 
   // Unable to find the |field_contents| in |suggestion| text.
   return base::string16::npos;
 }
 
+bool IsDesktopPlatform() {
+#if defined(OS_ANDROID) || defined(OS_IOS)
+  return false;
+#else
+  return true;
+#endif
+}
+
 }  // namespace autofill