Revert r150536 - "Added a timezone policy and pyauto tests for it."

chrome/browser/policy/device_policy_cache.cc

Index: chrome/browser/policy/device_policy_cache.cc
diff --git a/chrome/browser/policy/device_policy_cache.cc b/chrome/browser/policy/device_policy_cache.cc
index da632e3c9e12cd6d6e17867f4aa6dd44f46e8025..1cf962dabc9e721384745c1f1beec4d398179712 100644
--- a/chrome/browser/policy/device_policy_cache.cc
+++ b/chrome/browser/policy/device_policy_cache.cc
@@ -722,16 +722,6 @@ void DevicePolicyCache::DecodeGenericPolicies(
                     urls);
     }
   }
-
-  if (policy.has_system_timezone()) {
-    if (policy.system_timezone().has_timezone()) {
-      policies->Set(key::kDeviceTimezone,
-                    POLICY_LEVEL_MANDATORY,
-                    POLICY_SCOPE_MACHINE,
-                    Value::CreateStringValue(
-                        policy.system_timezone().timezone()));
-    }
-  }
 }
 
 }  // namespace policy