Call scoped_refptr<T>::get() rather than relying on implicit "operator T*"

chrome/common/extensions/extension_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_SET_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_SET_H_
 
 #include <iterator>
 #include <map>
 #include <string>
@@ skipping 43 matching lines @@
     const_iterator();
     const_iterator(const const_iterator& other);
     explicit const_iterator(ExtensionMap::const_iterator it);
     const_iterator& operator++() {
       ++it_;
       return *this;
     }
     const scoped_refptr<const extensions::Extension> operator*() {
       return it_->second;
     }
+    const scoped_refptr<const extensions::Extension>* operator->() {
+      return &it_->second;
+    }
     bool operator!=(const const_iterator& other) { return it_ != other.it_; }
     bool operator==(const const_iterator& other) { return it_ == other.it_; }
 
    private:
     ExtensionMap::const_iterator it_;
   };
 
   ExtensionSet();
   ~ExtensionSet();
 
@@ skipping 65 matching lines @@
 
  private:
   FRIEND_TEST_ALL_PREFIXES(ExtensionSetTest, ExtensionSet);
 
   ExtensionMap extensions_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionSet);
 };
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_SET_H_