Move extension_icon_set.{h,cc} to //extensions

extensions/common/extension_icon_set.cc

 // Copyright (c) 2012 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 "chrome/common/extensions/extension_icon_set.h"
+#include "extensions/common/extension_icon_set.h"
 
 #include "base/logging.h"
 
 ExtensionIconSet::ExtensionIconSet() {}
 
 ExtensionIconSet::~ExtensionIconSet() {}
 
 void ExtensionIconSet::Clear() {
   map_.clear();
 }
@@ skipping 45 matching lines @@
       "ExtensionIconSet stores icon paths without leading slash.";
 
   for (IconMap::const_iterator iter = map_.begin(); iter != map_.end();
        ++iter) {
     if (iter->second == path)
       return iter->first;
   }
 
   return 0;
 }