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

test/cctest/compiler/test-representation-change.cc

Index: test/cctest/compiler/test-representation-change.cc
diff --git a/test/cctest/compiler/test-representation-change.cc b/test/cctest/compiler/test-representation-change.cc
index 2970d5209b4146bbb509db196bbc075b6942e37e..616c3736e174ebb0a02159fd9213110c1363b7d7 100644
--- a/test/cctest/compiler/test-representation-change.cc
+++ b/test/cctest/compiler/test-representation-change.cc
@@ -15,10 +15,7 @@
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/representation-change.h"
 
-using namespace v8::internal;
-using namespace v8::internal::compiler;
-
-namespace v8 {  // for friendiness.
+namespace v8 {
 namespace internal {
 namespace compiler {
 
@@ -102,9 +99,6 @@ class RepresentationChangerTester : public HandleAndZoneScope,
     CHECK_EQ(n, c);
   }
 };
-}  // namespace compiler
-}  // namespace internal
-}  // namespace v8
 
 
 static const MachineType all_reps[] = {kRepBit,     kRepWord32,  kRepWord64,
@@ -553,3 +547,7 @@ TEST(TypeErrors) {
     }
   }
 }
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8