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

test/cctest/compiler/test-run-stubs.cc

Index: test/cctest/compiler/test-run-stubs.cc
diff --git a/test/cctest/compiler/test-run-stubs.cc b/test/cctest/compiler/test-run-stubs.cc
index e547fd7224dc1c7a9dd6ae661ae3f191b197f502..c4751c0e287990ff99b22714a5e37b88f705271c 100644
--- a/test/cctest/compiler/test-run-stubs.cc
+++ b/test/cctest/compiler/test-run-stubs.cc
@@ -17,8 +17,9 @@
 #include "src/parser.h"
 #include "test/cctest/compiler/function-tester.h"
 
-using namespace v8::internal;
-using namespace v8::internal::compiler;
+namespace v8 {
+namespace internal {
+namespace compiler {
 
 
 TEST(RunOptimizedMathFloorStub) {
@@ -143,3 +144,7 @@ TEST(RunStringAddTFStub) {
   Handle<Object> result = ft.Call(leftArg, rightArg).ToHandleChecked();
   CHECK(String::Equals(ft.Val("linksrechts"), Handle<String>::cast(result)));
 }
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8