depot_tools doesn't support python 2.5 anymore.

PRESUBMIT.py

Index: PRESUBMIT.py
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 3ae6bcb0f65eb0d8f3d539d17cfbcd5e04186a02..39794a818fa0ac223917fc4735e0f65f188947ed 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -11,18 +11,6 @@ details on the presubmit API built into depot_tools.
 
 def CommonChecks(input_api, output_api, tests_to_black_list):
   results = []
-  import sys
-  if not sys.version.startswith('2.5'):
-    # Depot_tools has the particularity that it needs to be tested on python
-    # 2.5. But we don't want the presubmit check to fail if it is not installed.
-    results.append(output_api.PresubmitNotifyResult(
-        'You should install python 2.5 and run ln -s $(which python2.5) python.'
-        '\n'
-        'A great place to put this symlink is in depot_tools.\n'
-        'Otherwise, you break depot_tools on python 2.5, you get to keep the '
-        'pieces.'))
-
-
   results.extend(input_api.canned_checks.CheckOwners(input_api, output_api))
   black_list = list(input_api.DEFAULT_BLACK_LIST) + [
       r'^cpplint\.py$',