Update tests to use new mapping APIs

This CL updates all tests not specific to the old mapping API to use the
new mapping APIs. (a couple old tests that caused difficult diffs were
removed early).

Also fix an issue where the mapAsync callback wasn't fired with Unknown
when the buffer was destroyed.

Bug: dawn:445

Change-Id: I0101f533ecb1fd995066742b60a833dc2ad522aa
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/26300
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>

src/dawn_native/Buffer.cpp

diff --git a/src/dawn_native/Buffer.cpp b/src/dawn_native/Buffer.cpp
index 0cd6eae..1fcc3be 100644
--- a/src/dawn_native/Buffer.cpp
+++ b/src/dawn_native/Buffer.cpp
@@ -151,6 +151,7 @@
             ASSERT(!IsError());
             CallMapReadCallback(mMapSerial, WGPUBufferMapAsyncStatus_Unknown, nullptr, 0u);
             CallMapWriteCallback(mMapSerial, WGPUBufferMapAsyncStatus_Unknown, nullptr, 0u);
+            CallMapCallback(mMapSerial, WGPUBufferMapAsyncStatus_Unknown);
         }
     }
 
@@ -468,6 +469,7 @@
 
             mMapReadCallback = nullptr;
             mMapWriteCallback = nullptr;
+            mMapCallback = nullptr;
             mMapUserdata = 0;
 
         } else if (mState == BufferState::MappedAtCreation) {