Fix GetCachedFile.

BUG=none
TEST=gcl upload works when there's no codereview.settings in the cache.
Review URL: http://codereview.chromium.org/3366001

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@58270 0039d316-1c4b-4281-b951-d872f2087c98

gcl.py

@@ -143,7 +143,7 @@ def GetCachedFile(filename, max_age=60*60*24*3, use_root=False):
             # stderr into content_array.
             content_array = []
             svn_path = url_path + '/' + filename
-            args = ['cat', svn_path]
+            args = ['svn', 'cat', svn_path]
             if sys.platform != 'darwin':
               # MacOSX 10.5.2 has a bug with svn 1.4.4 that will trigger the
               # 'Can\'t get username or password' and can be fixed easily.