Cleanup two warning messages when running apidoc, and update the apidoc.gyp file to rerun the tool

utils/apidoc/apidoc.gyp

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 {
   'variables' : {
     'script_suffix%': '',
   },
   'conditions' : [
     ['OS=="win"', {
@@ skipping 20 matching lines @@
           'inputs': [
             '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)dart<(EXECUTABLE_SUFFIX)',
             '<(PRODUCT_DIR)/dart2js.snapshot',
             '<!@(["python", "../../tools/list_files.py", "\\.(css|ico|js|json|png|sh|txt|yaml|py)$", ".", "../../sdk/lib/_internal/dartdoc"])',
             '<!@(["python", "../../tools/list_files.py", "\\.dart$", "../../sdk/lib", "../../runtime/lib", "../../runtime/bin"])',
             '../../sdk/bin/dart',
             '../../sdk/bin/dart.bat',
             '../../sdk/bin/dart2js',
             '../../sdk/bin/dart2js.bat',
           ],
+          'inputs': [

[ahe, 2013/04/05 19:01:00]

This overwrites the previous value of 'inputs'.  Now apidoc isn't being re-run
as the SDK changes, and neither if dartdoc has changed.

[devoncarew, 2013/04/05 19:09:21]

Sorry, my bad. I had noticed that it wasn't being re-run when apidoc.dart itself
changed, which was the problem I was originally trying to solve.

[ahe, 2013/04/05 19:13:38]

No worries. GYP is so complicated, that's why I really don't mind getting
spammed with GYP changes, as I seem to have a knack for spotting problems :-)

I've already sent you an CL to fix it.

+            '<!@(["python", "../../tools/list_files.py", "\\.(css|png|dart)$", "."])',
+          ],
           'outputs': [
             '<(PRODUCT_DIR)/api_docs/index.html',
             '<(PRODUCT_DIR)/api_docs/client-static.js',
           ],
           'action': [
             '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)dart<(EXECUTABLE_SUFFIX)',
             'apidoc.dart',
             '--out=<(PRODUCT_DIR)/api_docs',
             '--version=<!@(["python", "../../tools/print_version.py"])',
             '--pkg=<(PRODUCT_DIR)/packages/',
             '--mode=static',
             '--exclude-lib=dartdoc',
             '--exclude-lib=http',
             '--exclude-lib=oauth2',
             '--exclude-lib=pathos',
             '--exclude-lib=webdriver',
             '--exclude-lib=yaml',
             '--include-lib=matcher',
             '--include-lib=mock',
             '--include-lib=scheduled_test',
           ],
           'message': 'Running apidoc: <(_action)',
         },
       ],
     }
   ],
 }