Move and improve RefCounted

- Move RefCounted to common (from dawn_native) so that we can use
it from additional places.
- Use EXPECT_ macros instead of ASSERT_ in RefCounted tests for
improved logging on failures.
- Add a missing test for Ref::Detach.
- Plug memory leak in RaceOnReferenceRelease

Change-Id: Iaa7b11b5a6fa146e3c322143279a21a4ac027547
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/19903
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Rafael Cintron <rafael.cintron@microsoft.com>

src/tests/unittests/GetProcAddressTests.cpp

@@ -90,7 +90,7 @@ namespace {
         }
 
       protected:
-        dawn_native::Ref<dawn_native::InstanceBase> mNativeInstance;
+        Ref<dawn_native::InstanceBase> mNativeInstance;
         dawn_native::null::Adapter mNativeAdapter;
 
         std::unique_ptr<utils::TerribleCommandBuffer> mC2sBuf;