[presubmit] Enable readability/namespace linter checking.

src/ppc/simulator-ppc.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 
 // Declares a Simulator for PPC instructions if we are not generating a native
 // PPC binary. This Simulator allows us to run and debug PPC code generation on
 // regular desktop machines.
 // V8 calls into generated code by "calling" the CALL_GENERATED_CODE macro,
 // which will start execution in the Simulator or forwards to the real entry
@@ skipping 36 matching lines @@
     USE(isolate);
     return c_limit;
   }
 
   static inline uintptr_t RegisterCTryCatch(uintptr_t try_catch_address) {
     return try_catch_address;
   }
 
   static inline void UnregisterCTryCatch() {}
 };
-}
-}  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #else  // !defined(USE_SIMULATOR)
 // Running with a simulator.
 
 #include "src/assembler.h"
 #include "src/hashmap.h"
 #include "src/ppc/constants-ppc.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 346 matching lines @@
 
   static inline uintptr_t RegisterCTryCatch(uintptr_t try_catch_address) {
     Simulator* sim = Simulator::current(Isolate::Current());
     return sim->PushAddress(try_catch_address);
   }
 
   static inline void UnregisterCTryCatch() {
     Simulator::current(Isolate::Current())->PopAddress();
   }
 };
-}
-}  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // !defined(USE_SIMULATOR)
 #endif  // V8_PPC_SIMULATOR_PPC_H_