Remove NOTREACHED() from ToDawnFormat()

GPU process was crashing due to NOTREACHED() being reacheable when
playing video on Fuchsia. Removed NOTREACHED().

Bug: 1031793
Change-Id: I7b8e5ab9b155fe3661276871c658ec335a121960
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1957903
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Eric Karl <ericrk@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723513}

components/viz/common/resources/resource_format_utils.cc

@@ -518,7 +518,6 @@ wgpu::TextureFormat ToDawnFormat(ResourceFormat format) {
     case P010:
       break;
   }
-  NOTREACHED() << "Unsupported format " << format;
   return wgpu::TextureFormat::Undefined;
 }