[presubmit] Enable readability/namespace linter checking.

src/code-stubs.h

 // Copyright 2012 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.
 
 #ifndef V8_CODE_STUBS_H_
 #define V8_CODE_STUBS_H_
 
 #include "src/allocation.h"
 #include "src/assembler.h"
 #include "src/codegen.h"
@@ skipping 579 matching lines @@
   virtual void AfterCall(MacroAssembler* masm) const = 0;
 
  protected:
   RuntimeCallHelper() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RuntimeCallHelper);
 };
 
 
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #if V8_TARGET_ARCH_IA32
 #include "src/ia32/code-stubs-ia32.h"
 #elif V8_TARGET_ARCH_X64
 #include "src/x64/code-stubs-x64.h"
 #elif V8_TARGET_ARCH_ARM64
 #include "src/arm64/code-stubs-arm64.h"
 #elif V8_TARGET_ARCH_ARM
 #include "src/arm/code-stubs-arm.h"
 #elif V8_TARGET_ARCH_PPC
@@ skipping 2480 matching lines @@
 #undef DEFINE_HYDROGEN_CODE_STUB
 #undef DEFINE_CODE_STUB
 #undef DEFINE_CODE_STUB_BASE
 
 extern Representation RepresentationFromType(Type* type);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODE_STUBS_H_