Remove const qualifiers from Drive/GData files to avoid compile errors on Mac buildbots

chrome/browser/chromeos/gdata/gdata_wapi_parser.h

Index: chrome/browser/chromeos/gdata/gdata_wapi_parser.h
diff --git a/chrome/browser/chromeos/gdata/gdata_wapi_parser.h b/chrome/browser/chromeos/gdata/gdata_wapi_parser.h
index b3739b7cc1a2036de22cea42a75cd4711d317a27..cfc797c79a4b513e9539ca2553d2c626de5fa988 100644
--- a/chrome/browser/chromeos/gdata/gdata_wapi_parser.h
+++ b/chrome/browser/chromeos/gdata/gdata_wapi_parser.h
@@ -272,7 +272,7 @@ class AppIcon {
   IconCategory category() const { return category_; }
 
   // Size in pixels of one side of the icon (icons are always square).
-  const int icon_side_length() const { return icon_side_length_; }
+  int icon_side_length() const { return icon_side_length_; }
 
   // Get a list of links available for this AppIcon.
   const ScopedVector<Link>& links() const { return links_; }