Improve spelling of "notification".

components/policy/core/common/schema_registry_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/policy/core/common/schema_registry.h"
 
 #include "components/policy/core/common/policy_namespace.h"
 #include "components/policy/core/common/schema.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 208 matching lines @@
   EXPECT_FALSE(combined.schema_map()->GetSchema(
       PolicyNamespace(POLICY_DOMAIN_EXTENSIONS, "def")));
 
   EXPECT_CALL(observer, OnSchemaRegistryUpdated(true)).Times(2);
   registry1.RegisterComponent(PolicyNamespace(POLICY_DOMAIN_CHROME, ""),
                               schema);
   registry2.RegisterComponent(PolicyNamespace(POLICY_DOMAIN_EXTENSIONS, "hij"),
                               schema);
   Mock::VerifyAndClearExpectations(&observer);
 
-  // Untracking |registry1| doesn't trigger an update nofitication, because it
+  // Untracking |registry1| doesn't trigger an update notification, because it
   // doesn't contain any components.
   EXPECT_CALL(observer, OnSchemaRegistryUpdated(_)).Times(0);
   combined.Untrack(&registry1);
   Mock::VerifyAndClearExpectations(&observer);
 
   EXPECT_CALL(observer, OnSchemaRegistryUpdated(false));
   combined.Untrack(&registry2);
   Mock::VerifyAndClearExpectations(&observer);
 
   combined.RemoveObserver(&observer);
 }
 
 }  // namespace policy