Moved zones and zone related stuff in its own directory.

test/cctest/test-bit-vector.cc

Index: test/cctest/test-bit-vector.cc
diff --git a/test/cctest/test-bit-vector.cc b/test/cctest/test-bit-vector.cc
index 6b9fbc7ee266a45c02289b60273ddff999e5bdbd..99c5a68d45443fcc3f3f5c6811756a6f3632d730 100644
--- a/test/cctest/test-bit-vector.cc
+++ b/test/cctest/test-bit-vector.cc
@@ -35,7 +35,7 @@
 using namespace v8::internal;
 
 TEST(BitVector) {
-  v8::base::AccountingAllocator allocator;
+  v8::internal::AccountingAllocator allocator;
   Zone zone(&allocator);
   {
     BitVector v(15, &zone);