[build] Fix header-hygiene warnings for arm64

test/cctest/test-utils-arm64.cc

 // 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 14 matching lines @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "src/v8.h"
 
 #include "src/arm64/utils-arm64.h"
 #include "src/macro-assembler.h"
 #include "test/cctest/cctest.h"
 #include "test/cctest/test-utils-arm64.h"
 
-using namespace v8::internal;
+namespace v8 {
+namespace internal {
 
 
 #define __ masm->
 
 
 bool Equal32(uint32_t expected, const RegisterDump*, uint32_t result) {
   if (result != expected) {
     printf("Expected 0x%08" PRIx32 "\t Found 0x%08" PRIx32 "\n",
            expected, result);
   }
@@ skipping 370 matching lines @@
   // Finally, restore dump2_base and dump2.
   __ Ldr(dump2_base, MemOperand(dump2, dump2_base.code() * kXRegSize));
   __ Ldr(dump2, MemOperand(dump2, dump2.code() * kXRegSize));
 
   // Restore the MacroAssembler's scratch registers.
   masm->TmpList()->set_list(old_tmp_list);
   masm->FPTmpList()->set_list(old_fptmp_list);
 
   completed_ = true;
 }
+
+}  // namespace internal
+}  // namespace v8