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

extensions/common/extension_icon_set.h

 // 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.
 
-#ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_ICON_SET_H_
-#define CHROME_COMMON_EXTENSIONS_EXTENSION_ICON_SET_H_
+#ifndef EXTENSIONS_COMMON_EXTENSION_ICON_SET_H_
+#define EXTENSIONS_COMMON_EXTENSION_ICON_SET_H_
 
 #include <map>
 #include <string>
 
 // Represents the set of icons for an extension.
 class ExtensionIconSet {
  public:
   // Get an icon from the set, optionally falling back to a smaller or bigger
   // size. MatchType is exclusive (do not OR them together).
   enum MatchType {
@@ skipping 25 matching lines @@
   // Returns true iff the set contains the specified path.
   bool ContainsPath(const std::string& path) const;
 
   // Returns icon size if the set contains the specified path or 0 if not found.
   int GetIconSizeFromPath(const std::string& path) const;
 
  private:
   IconMap map_;
 };
 
-#endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_ICON_SET_H_
+#endif  // EXTENSIONS_COMMON_EXTENSION_ICON_SET_H_