Pass const ref instead of pointer for FromDocumentEntry()

chrome/browser/chromeos/gdata/gdata_directory_service.h

Index: chrome/browser/chromeos/gdata/gdata_directory_service.h
diff --git a/chrome/browser/chromeos/gdata/gdata_directory_service.h b/chrome/browser/chromeos/gdata/gdata_directory_service.h
index 793fa7ad0c02fa07457f5d112b27e4f45db637dd..1bbad7910f7ecf39014868beaafecc6aa1090adc 100644
--- a/chrome/browser/chromeos/gdata/gdata_directory_service.h
+++ b/chrome/browser/chromeos/gdata/gdata_directory_service.h
@@ -146,7 +146,7 @@ class GDataDirectoryService {
   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();
@@ -312,4 +312,3 @@ class GDataDirectoryService {
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_DIRECTORY_SERVICE_H_
-