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

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

Index: test/cctest/compiler/test-run-stackcheck.cc
diff --git a/test/cctest/compiler/test-run-stackcheck.cc b/test/cctest/compiler/test-run-stackcheck.cc
index d384a7c15f2650117391149d799bb74813192f41..bba411d2830888e9245d510aedc21122b4e14cd5 100644
--- a/test/cctest/compiler/test-run-stackcheck.cc
+++ b/test/cctest/compiler/test-run-stackcheck.cc
@@ -7,8 +7,9 @@
 
 #include "test/cctest/compiler/function-tester.h"
 
-using namespace v8::internal;
-using namespace v8::internal::compiler;
+namespace v8 {
+namespace internal {
+namespace compiler {
 
 TEST(TerminateAtMethodEntry) {
   FunctionTester T("(function(a,b) { return 23; })");
@@ -17,3 +18,7 @@ TEST(TerminateAtMethodEntry) {
   T.isolate->stack_guard()->RequestTerminateExecution();
   T.CheckThrows(T.undefined(), T.undefined());
 }
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8