Include order check should work better for files containing uncheckable includes

PRESUBMIT.py

 # 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.
 
 """Top-level presubmit script for Chromium.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into gcl.
 """
 
@@ skipping 648 matching lines @@
         # includes.
         line_num -= 1
       break
 
   # Split into scopes: Each region between #if and #endif is its own scope.
   scopes = []
   current_scope = []
   for line in contents[line_num:]:
     line_num += 1
     if uncheckable_includes_pattern.match(line):
-      return []
+      continue
     if if_pattern.match(line):
       scopes.append(current_scope)
       current_scope = []
     elif ((system_include_pattern.match(line) or
            custom_include_pattern.match(line)) and
           not excluded_include_pattern.match(line)):
       current_scope.append((line_num, line))
   scopes.append(current_scope)
 
   for scope in scopes:
@@ skipping 745 matching lines @@
     trybots.extend(GetDefaultTryConfigs(['cros_x86']))
 
   # The AOSP bot doesn't build the chrome/ layer, so ignore any changes to it
   # unless they're .gyp(i) files as changes to those files can break the gyp
   # step on that bot.
   if (not all(re.search('^chrome', f) for f in files) or
       any(re.search('\.gypi?$', f) for f in files)):
     trybots.extend(GetDefaultTryConfigs(['android_aosp']))
 
   return trybots