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

test/cctest/compiler/test-gap-resolver.cc

Index: test/cctest/compiler/test-gap-resolver.cc
diff --git a/test/cctest/compiler/test-gap-resolver.cc b/test/cctest/compiler/test-gap-resolver.cc
index 5796f457cdd0cb2ef62c7c584088ce243727b59e..fbe3509b9767ce6d6122465dc97447fe2d84e562 100644
--- a/test/cctest/compiler/test-gap-resolver.cc
+++ b/test/cctest/compiler/test-gap-resolver.cc
@@ -10,8 +10,9 @@
 #include "src/base/utils/random-number-generator.h"
 #include "test/cctest/cctest.h"
 
-using namespace v8::internal;
-using namespace v8::internal::compiler;
+namespace v8 {
+namespace internal {
+namespace compiler {
 
 // The state of our move interpreter is the mapping of operands to values. Note
 // that the actual values don't really matter, all we care about is equality.
@@ -255,3 +256,7 @@ TEST(FuzzResolver) {
     }
   }
 }
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8