Add a policy to allow NTP promotions & default apps to be disabled.

chrome/browser/policy/configuration_policy_pref_store.cc

Index: chrome/browser/policy/configuration_policy_pref_store.cc
diff --git a/chrome/browser/policy/configuration_policy_pref_store.cc b/chrome/browser/policy/configuration_policy_pref_store.cc
index 3f74a0137462f5aa2b69d064884410bdb46f64ba..7ed6916d1c8d4244c2e0aa8dbb70e9bc292ce6dc 100644
--- a/chrome/browser/policy/configuration_policy_pref_store.cc
+++ b/chrome/browser/policy/configuration_policy_pref_store.cc
@@ -282,6 +282,8 @@ const ConfigurationPolicyPrefKeeper::PolicyToPreferenceMapEntry
     prefs::kAllowFileSelectionDialogs },
   { Value::TYPE_INTEGER, kPolicyMaxConnectionsPerProxy,
     prefs::kMaxConnectionsPerProxy },
+  { Value::TYPE_BOOLEAN, kPolicyHideWebStorePromo,
+    prefs::kNTPHideWebStorePromo },
 
 #if defined(OS_CHROMEOS)
   { Value::TYPE_BOOLEAN, kPolicyChromeOsLockOnIdleSuspend,
@@ -1091,6 +1093,8 @@ ConfigurationPolicyPrefStore::GetChromePolicyDefinitionList() {
       key::kDiskCacheDir },
     { kPolicyMaxConnectionsPerProxy, Value::TYPE_INTEGER,
       key::kMaxConnectionsPerProxy },
+    { kPolicyHideWebStorePromo, Value::TYPE_BOOLEAN,
+      key::kHideWebStorePromo },
 
 #if defined(OS_CHROMEOS)
     { kPolicyChromeOsLockOnIdleSuspend, Value::TYPE_BOOLEAN,