Move compiler cctests into v8::internal::compiler namespace.

test/cctest/compiler/test-multiple-return.cc

 // 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.
 
 // TODO(jochen): Remove this after the setting is turned on globally.
 #define V8_IMMINENT_DEPRECATION_WARNINGS
 
 #include <cmath>
 #include <functional>
 #include <limits>
 
 #include "src/assembler.h"
 #include "src/base/bits.h"
 #include "src/base/utils/random-number-generator.h"
 #include "src/codegen.h"
 #include "src/compiler.h"
 #include "src/compiler/linkage.h"
 #include "src/macro-assembler.h"
 #include "test/cctest/cctest.h"
 #include "test/cctest/compiler/codegen-tester.h"
 #include "test/cctest/compiler/value-helper.h"
 
-
-using namespace v8::base;
-using namespace v8::internal;
-using namespace v8::internal::compiler;
-
+namespace v8 {
+namespace internal {
+namespace compiler {
 
 namespace {
 
 CallDescriptor* GetCallDescriptor(Zone* zone, int return_count,
                                   int param_count) {
   MachineSignature::Builder msig(zone, return_count, param_count);
   LocationSignature::Builder locations(zone, return_count, param_count);
   const RegisterConfiguration* config =
       RegisterConfiguration::ArchDefault(RegisterConfiguration::TURBOFAN);
 
@@ skipping 72 matching lines @@
   mt.Return(ret);
 #ifdef ENABLE_DISASSEMBLER
   Handle<Code> code2 = mt.GetCode();
   if (FLAG_print_code) {
     OFStream os(stdout);
     code2->Disassemble("three_value_call", os);
   }
 #endif
   CHECK_EQ((123 + 456) + (123 - 456) + (123 * 456), mt.Call());
 }
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8