Make unittests and fuzzers use webgpu.h

BUG=dawn:22

Change-Id: Iff5465ad7a9456f9c6b2ee380af748b3afc129b7
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/12741
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
diff --git a/src/tests/unittests/ObjectBaseTests.cpp b/src/tests/unittests/ObjectBaseTests.cpp
index 376d004..6c3f2d7 100644
--- a/src/tests/unittests/ObjectBaseTests.cpp
+++ b/src/tests/unittests/ObjectBaseTests.cpp
@@ -14,7 +14,7 @@
 
 #include <gtest/gtest.h>
 
-#include "dawn/dawncpp.h"
+#include "dawn/webgpu_cpp.h"
 
 class Object : public wgpu::ObjectBase<Object, int*> {
   public: