Remove lingered condition for isolation key w.r.t enable-unsafe-webgpu.

Note:
The requirement for the flag was removed in
https://chromium-review.googlesource.com/c/chromium/src/+/4038415 but
this condition was unintentionally left in. This causes device
initialization to hang when the flag is not specified. This change will
need to be back-rolled into M110 branch.

(cherry picked from commit 73800c0)

Bug: chromium:1410915
Change-Id: Ie0e30bccb19d710878aa80e18833dc5a400b020e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4191632
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Loko Kung <lokokung@google.com>
Cr-Original-Commit-Position: refs/heads/main@{#1098201}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4205508
Cr-Commit-Position: refs/branch-heads/5481@{#812}
Cr-Branched-From: 130f3e4-refs/heads/main@{#1084008}

gpu/command_buffer/service/webgpu_decoder_impl.cc

@@ -2034,13 +2034,11 @@ error::Error WebGPUDecoderImpl::HandleSetWebGPUExecutionContextToken(
       NOTREACHED();
       return error::kInvalidArguments;
   }
-  if (enable_unsafe_webgpu_) {
-    isolation_key_provider_->GetIsolationKey(
-        execution_context_token,
-        base::BindPostTask(base::SingleThreadTaskRunner::GetCurrentDefault(),
-                           base::BindOnce(&WebGPUDecoderImpl::OnGetIsolationKey,
-                                          weak_ptr_factory_.GetWeakPtr())));
-  }
+  isolation_key_provider_->GetIsolationKey(
+      execution_context_token,
+      base::BindPostTask(base::SingleThreadTaskRunner::GetCurrentDefault(),
+                         base::BindOnce(&WebGPUDecoderImpl::OnGetIsolationKey,
+                                        weak_ptr_factory_.GetWeakPtr())));
   return error::kNoError;
 }