Cosmetic changes to tests to make it easier to concatenate them.

test/cctest/test-weakmaps.cc

Index: test/cctest/test-weakmaps.cc
diff --git a/test/cctest/test-weakmaps.cc b/test/cctest/test-weakmaps.cc
index 125557850d6391551059d4bc296b7dff676b5be8..a2a8a4dd5d3c16f749b591f283890e51f7165318 100644
--- a/test/cctest/test-weakmaps.cc
+++ b/test/cctest/test-weakmaps.cc
@@ -34,6 +34,7 @@
 
 using namespace v8::internal;
 
+namespace weakmap_tests {
 
 static Isolate* GetIsolateFrom(LocalContext* context) {
   return reinterpret_cast<Isolate*>((*context)->GetIsolate());
@@ -267,3 +268,4 @@ TEST(Regress399527) {
   // marking bits which makes the weak map garbage.
   heap->CollectAllGarbage();
 }
+}