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This reverts commit 74c69a75.

Reason for revert: causing first build failure on Deterministic Fuchsia (dbg).

Sample build: https://ci.chromium.org/p/chromium/builders/ci/Deterministic%20Fuchsia%20%28dbg%29/561

Sample log: https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8903731569632286240/+/steps/First_build/0/stdout?format=raw

[47036/47333] SOLINK ./lib/libweb_engine_core.so
...
ld.lld: error: undefined symbol: switches::kEnableFeatures
>>> referenced by context_provider_impl.cc:208 (../../fuchsia/engine/context_provider_impl.cc:208)
>>>               obj/fuchsia/engine/web_engine_core/context_provider_impl.o:(ContextProviderImpl::Create(fuchsia::web::CreateContextParams, fidl::InterfaceRequest<fuchsia::web::Context>))

ld.lld: error: undefined symbol: gl::kGLImplementationStubName
>>> referenced by context_provider_impl.cc:212 (../../fuchsia/engine/context_provider_impl.cc:212)
>>>               obj/fuchsia/engine/web_engine_core/context_provider_impl.o:(ContextProviderImpl::Create(fuchsia::web::CreateContextParams, fidl::InterfaceRequest<fuchsia::web::Context>))
clang: error: ld.lld command failed with exit code 1 (use -v to see invocation)
[47037/47333] AR obj/components/password_manager/core/browser/libbrowser.a
[47038/47333] AR obj/components/sync_sessions/libsync_sessions.a


Original change's description:
> [Fuchsia] Handle VULKAN feature flag in WebEngine
> 
> Now WebEngine will enable Vulkan only when ContextFeatureFlags::VULKAN
> is specified for web::Context. Also Context process now explicitly
> disables hardware-accelerated compositing when VULKAN is not enabled
> (otherwise it restarts the GPU process several times before it falls
> back to software compositing).
> 
> Bug: 962617, fuchsia:35009
> Change-Id: I74a463a1514df99134d929981fe44151c1d9dd17
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1774967
> Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
> Reviewed-by: Jonathan Backer <backer@chromium.org>
> Reviewed-by: Wez <wez@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#691856}

TBR=backer@chromium.org,wez@chromium.org,sergeyu@chromium.org

Change-Id: I71d9bb87b79928bbffa9f123408b4e4bafad31bc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 962617, fuchsia:35009
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1775955Reviewed-by: Takashi Sakamoto <tasak@google.com>
Commit-Queue: Takashi Sakamoto <tasak@google.com>
Cr-Commit-Position: refs/heads/master@{#691941}