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

test/cctest/compiler/test-node.cc

Index: test/cctest/compiler/test-node.cc
diff --git a/test/cctest/compiler/test-node.cc b/test/cctest/compiler/test-node.cc
index 91ec7b06d6f2feb9bdeda6c7d71b163a4431e398..fcd6b74c4b8e69fa49f63406934063561d9ede35 100644
--- a/test/cctest/compiler/test-node.cc
+++ b/test/cctest/compiler/test-node.cc
@@ -12,8 +12,9 @@
 #include "src/compiler/operator.h"
 #include "test/cctest/cctest.h"
 
-using namespace v8::internal;
-using namespace v8::internal::compiler;
+namespace v8 {
+namespace internal {
+namespace compiler {
 
 #define NONE reinterpret_cast<Node*>(1)
 
@@ -785,3 +786,7 @@ TEST(AppendAndTrim) {
     CHECK_USES(last, NONE);
   }
 }
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8