Pass const ref instead of pointer for FromDocumentEntry()

chrome/browser/chromeos/gdata/gdata_directory_service.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_BROWSER_CHROMEOS_GDATA_GDATA_DIRECTORY_SERVICE_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_DIRECTORY_SERVICE_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 128 matching lines @@
   // Largest change timestamp that was the source of content for the current
   // state of the root directory.
   const int64 largest_changestamp() const { return largest_changestamp_; }
   void set_largest_changestamp(int64 value) { largest_changestamp_ = value; }
 
   // The root directory content origin.
   const ContentOrigin origin() const { return origin_; }
   void set_origin(ContentOrigin value) { origin_ = value; }
 
   // Creates a GDataEntry from a DocumentEntry.
-  GDataEntry* FromDocumentEntry(DocumentEntry* doc);
+  GDataEntry* FromDocumentEntry(const DocumentEntry& doc);
 
   // Creates a GDataFile instance.
   GDataFile* CreateGDataFile();
 
   // Creates a GDataDirectory instance.
   GDataDirectory* CreateGDataDirectory();
 
   // Sets root directory resource id and initialize the root entry.
   void InitializeRootEntry(const std::string& root_id);
 
@@ skipping 145 matching lines @@
   // This should remain the last member so it'll be destroyed first and
   // invalidate its weak pointers before other members are destroyed.
   base::WeakPtrFactory<GDataDirectoryService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GDataDirectoryService);
 };
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_DIRECTORY_SERVICE_H_
-