Deprecated HideWebStorePromo policy and updated the pyauto test case for it.

TBR=nirnimesh@chromium.org
BUG=140760

Review URL: https://chromiumcodereview.appspot.com/10825197

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150078 0039d316-1c4b-4281-b951-d872f2087c98

chrome/app/policy/policy_templates.json

@@ -2403,7 +2403,8 @@
       'name': 'HideWebStorePromo',
       'type': 'main',
       'schema': { 'type': 'boolean' },
-      'supported_on': ['chrome.*:15-', 'chrome_os:0.15-'],
+      'supported_on': ['chrome.*:15-21', 'chrome_os:0.15-21'],
+      'deprecated': True,
       'features': {'dynamic_refresh': False},
       'example_value': False,
       'id': 96,

chrome/test/functional/policy_test_cases.py

@@ -231,7 +231,7 @@ class PolicyPrefsTestCases(object):
     'ImportSavedPasswords':
         ('kImportSavedPasswords', False, [], ['win', 'mac', 'linux']),
     'MaxConnectionsPerProxy': ('kMaxConnectionsPerProxy', 32, [], OS_ALL),
-    'HideWebStorePromo': ('kNtpHideWebStorePromo', True, [], OS_ALL),
+    'HideWebStorePromo': (None, True, [], OS_ALL),
     'URLBlacklist': ('kUrlBlacklist', ['google.com'], [], OS_ALL),
     'URLWhitelist': ('kUrlWhitelist', ['google.com'], [], OS_ALL),
     'EnterpriseWebStoreURL': ('kEnterpriseWebStoreURL', '', [], OS_ALL),