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

test/cctest/compiler/test-js-context-specialization.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 "src/compiler/js-context-specialization.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/source-position.h"
 #include "test/cctest/cctest.h"
 #include "test/cctest/compiler/function-tester.h"
 #include "test/cctest/compiler/graph-builder-tester.h"
 
-using namespace v8::internal;
-using namespace v8::internal::compiler;
+namespace v8 {
+namespace internal {
+namespace compiler {
 
 class ContextSpecializationTester : public HandleAndZoneScope {
  public:
   ContextSpecializationTester()
       : graph_(new (main_zone()) Graph(main_zone())),
         common_(main_zone()),
         javascript_(main_zone()),
         machine_(main_zone()),
         simplified_(main_zone()),
         jsgraph_(main_isolate(), graph(), common(), &javascript_, &simplified_,
@@ skipping 281 matching lines @@
   {
     FunctionTester T(
         "(function() { if (false) { var x = 1; } function inc(a)"
         " { return a + x; } return inc; })()");  // x is undefined!
 
     CHECK(T.Call(T.Val(0.0), T.Val(0.0)).ToHandleChecked()->IsNaN());
     CHECK(T.Call(T.Val(2.0), T.Val(0.0)).ToHandleChecked()->IsNaN());
     CHECK(T.Call(T.Val(-2.1), T.Val(0.0)).ToHandleChecked()->IsNaN());
   }
 }
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8