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

test/cctest/compiler/test-osr.cc

Index: test/cctest/compiler/test-osr.cc
diff --git a/test/cctest/compiler/test-osr.cc b/test/cctest/compiler/test-osr.cc
index dd38511f51c86168988a62472c56f42dc5a51b31..7cc8fa6338c9ebfa2290dccddf8aff6c8f82d26c 100644
--- a/test/cctest/compiler/test-osr.cc
+++ b/test/cctest/compiler/test-osr.cc
@@ -16,8 +16,9 @@
 #include "src/compiler/osr.h"
 #include "test/cctest/cctest.h"
 
-using namespace v8::internal;
-using namespace v8::internal::compiler;
+namespace v8 {
+namespace internal {
+namespace compiler {
 
 // TODO(titzer): move this method to a common testing place.
 
@@ -566,3 +567,7 @@ TEST(Deconstruct_osr_nested3) {
   // depends on the copy of the outer loop0.
   CheckInputs(new_ret, new_loop0_phi, T.graph.start(), new_loop0_exit);
 }
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8