Ignore BindingLayoutEntryInitializationHelper for runtime/explicit.

This CL ignores runtime/explicit on BindingLayoutEntryInitializationHelper.

Bug: dawn:1339
Change-Id: I3b4554387138ea77648be7a1e4f714f269996acc
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/86643
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
Auto-Submit: Dan Sinclair <dsinclair@chromium.org>

src/dawn/utils/WGPUHelpers.h

@@ -134,6 +134,7 @@ namespace utils {
                                                wgpu::ShaderStage entryVisibility,
                                                wgpu::ExternalTextureBindingLayout* bindingLayout);
 
+        // NOLINTNEXTLINE(runtime/explicit)
         BindingLayoutEntryInitializationHelper(const wgpu::BindGroupLayoutEntry& entry);
     };