Retire the Enterprise Web Store policies.

chrome/test/data/policy/policy_test_cases.json

 {
   "-- Template --": {
     "intro": "Top-level entries map a policy name to its test parameters, described below.",
 
     "os": ["List of operating systems that support this policy. Valid values:", "win", "linux", "mac", "chromeos", "Defaults to empty if not specified."],
     "official_only": "Whether this policy exists in official builds only. Defaults to |false| if not specified.",
     "can_be_recommended": "Whether a recommended value may be set for the policy. Defaults to |false| if not specified.",
     "test_policy": "A policy dictionary that should make the preferences affected by this policy become policy-controlled. Usually just sets the current policy. Defaults to an empty dictionary if not specified.",
     "note": "If the policy affects any preferences, the following array should be specified with one entry per such preference.",
     "pref_mappings": [
@@ skipping 1341 matching lines @@
 
   "URLWhitelist": {
     "os": ["win", "linux", "mac", "chromeos"],
     "test_policy": { "URLWhitelist": ["google.com"] },
     "pref_mappings": [
       { "pref": "policy.url_whitelist" }
     ]
   },
 
   "EnterpriseWebStoreURL": {
-    "os": ["win", "linux", "mac", "chromeos"],
-    "test_policy": { "EnterpriseWebStoreURL": "http://example.com/webstore" },
-    "pref_mappings": [
-      { "pref": "webstore.enterprise_store_url" }
-    ]
+    "note": "This policy is retired, see http://crbug.com/178938."
   },
 
   "EnterpriseWebStoreName": {
-    "os": ["win", "linux", "mac", "chromeos"],
-    "test_policy": { "EnterpriseWebStoreName": "Example Webstore" },
-    "pref_mappings": [
-      { "pref": "webstore.enterprise_store_name" }
-    ]
+    "note": "This policy is retired, see http://crbug.com/178938."
   },
 
   "EnableMemoryInfo": {
     "os": ["win", "linux", "mac", "chromeos"],
     "test_policy": { "EnableMemoryInfo": true },
     "pref_mappings": [
       { "pref": "enable_memory_info" }
     ]
   },
 
@@ skipping 510 matching lines @@
 
   "ChromeFrameContentTypes": {
   },
 
   "GCFUserDataDir": {
   },
 
   "AdditionalLaunchParameters": {
   }
 }