Disable WebGPU: remove navigator.gpu.wgslLanguageFeatures (#1676)

build/patches/Disable-WebGPU.patch

@@ -6,8 +6,8 @@ License: GPL-2.0-or-later - https://spdx.org/licenses/GPL-2.0-or-later.html
 ---
  content/child/runtime_features.cc                | 2 ++
  gpu/config/gpu_finch_features.cc                 | 2 +-
- third_party/blink/renderer/modules/webgpu/gpu.cc | 1 +
- 3 files changed, 4 insertions(+), 1 deletion(-)
+ third_party/blink/renderer/modules/webgpu/gpu.cc | 3 +++
+ 3 files changed, 6 insertions(+), 1 deletion(-)
 
 diff --git a/content/child/runtime_features.cc b/content/child/runtime_features.cc
 --- a/content/child/runtime_features.cc
@@ -36,7 +36,16 @@ diff --git a/gpu/config/gpu_finch_features.cc b/gpu/config/gpu_finch_features.cc
 diff --git a/third_party/blink/renderer/modules/webgpu/gpu.cc b/third_party/blink/renderer/modules/webgpu/gpu.cc
 --- a/third_party/blink/renderer/modules/webgpu/gpu.cc
 +++ b/third_party/blink/renderer/modules/webgpu/gpu.cc
-@@ -401,6 +401,7 @@ ScriptPromise<IDLNullable<GPUAdapter>> GPU::requestAdapter(
+@@ -143,6 +143,8 @@ GPU::GPU(NavigatorBase& navigator)
+ GPU::~GPU() = default;
+ 
+ WGSLLanguageFeatures* GPU::wgslLanguageFeatures() const {
++  if (!base::FeatureList::IsEnabled(features::kWebGPUService))
++    return nullptr;
+   return wgsl_language_features_.Get();
+ }
+ 
+@@ -401,6 +403,7 @@ ScriptPromise<IDLNullable<GPUAdapter>> GPU::requestAdapter(
          "WebGPU is experimental on this platform. See "
          "https://github.com/gpuweb/gpuweb/wiki/"
          "Implementation-Status#implementation-status"));