[build] Fix header-hygiene warnings for arm64

test/cctest/test-utils-arm64.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 18 matching lines @@
 #define V8_ARM64_TEST_UTILS_ARM64_H_
 
 #include "src/v8.h"
 #include "test/cctest/cctest.h"
 
 #include "src/arm64/macro-assembler-arm64.h"
 #include "src/arm64/utils-arm64.h"
 #include "src/macro-assembler.h"
 
 
-using namespace v8::internal;

[Michael Achenbach, 2016/07/25 15:13:29]

https://www.chromium.org/developers/coding-style/chromium-style-checker-errors

Look for header-hygiene

+namespace v8 {
+namespace internal {
 
 
 // RegisterDump: Object allowing integer, floating point and flags registers
 // to be saved to itself for future reference.
 class RegisterDump {
  public:
   RegisterDump() : completed_(false) {}
 
   // The Dump method generates code to store a snapshot of the register values.
   // It needs to be able to use the stack temporarily, and requires that the
@@ skipping 173 matching lines @@
 
 // As Clobber, but for FP registers.
 void ClobberFP(MacroAssembler* masm, RegList reg_list,
                double const value = kFP64SignallingNaN);
 
 // As Clobber, but for a CPURegList with either FP or integer registers. When
 // using this method, the clobber value is always the default for the basic
 // Clobber or ClobberFP functions.
 void Clobber(MacroAssembler* masm, CPURegList reg_list);
 
+}  // namespace internal
+}  // namespace v8
+
 #endif  // V8_ARM64_TEST_UTILS_ARM64_H_