Add a policy to hide the Web Store on new tabs.

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 1440 matching lines @@
   "BuiltInDnsClientEnabled": {
     "os": ["win", "linux", "mac"],
     "test_policy": { "BuiltInDnsClientEnabled": true },
     "pref_mappings": [
       { "pref": "async_dns.enabled",
         "local_state": true
       }
     ]
   },
 
+  "HideWebStoreIcon": {
+    "os": ["win", "linux", "mac", "chromeos"],
+    "test_policy": { "HideWebStoreIcon": true },
+    "pref_mappings": [
+      { "pref": "hide_web_store_icon" }
+    ]
+  },
+
   "----- Chrome OS policies ------------------------------------------------": {},
 
   "ChromeOsLockOnIdleSuspend": {
     "os": ["chromeos"],
     "can_be_recommended": true,
     "test_policy": { "ChromeOsLockOnIdleSuspend": true },
     "pref_mappings": [
       { "pref": "settings.enable_screen_lock",
         "indicator_tests": [
           { "policy": { "ChromeOsLockOnIdleSuspend": true } }
@@ skipping 341 matching lines @@
 
   "ChromeFrameContentTypes": {
   },
 
   "GCFUserDataDir": {
   },
 
   "AdditionalLaunchParameters": {
   }
 }