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

test/cctest/compiler/test-branch-combine.cc

Index: test/cctest/compiler/test-branch-combine.cc
diff --git a/test/cctest/compiler/test-branch-combine.cc b/test/cctest/compiler/test-branch-combine.cc
index 84d8d990945a98278f8bb7ed8fe65a19b3f214da..984c7130ba646822a8af38d9fb96b6139560763c 100644
--- a/test/cctest/compiler/test-branch-combine.cc
+++ b/test/cctest/compiler/test-branch-combine.cc
@@ -9,8 +9,9 @@
 #include "test/cctest/compiler/codegen-tester.h"
 #include "test/cctest/compiler/value-helper.h"
 
-using namespace v8::internal;
-using namespace v8::internal::compiler;
+namespace v8 {
+namespace internal {
+namespace compiler {
 
 typedef RawMachineAssembler::Label MLabel;
 
@@ -458,3 +459,7 @@ TEST(BranchCombineFloat64Compares) {
     }
   }
 }
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8