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This reverts commit db2d4ad7.

Reason for revert: Suspicion that this causes a memory leak.

Original change's description:
> gpu: Share GrContext between RasterDecoders for OOP raster.
> 
> Use a common GrContext across all RasterDecoders. This ensures that we
> get a unified GrProgramCache for compiled shaders.
> 
> R=​backer@chromium.org, ericrk@chromium.org
> 
> Bug: 854416
> Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
> Change-Id: I653486d2a20f4bb0112c6cfe66f3922c222ad338
> Reviewed-on: https://chromium-review.googlesource.com/1114287
> Commit-Queue: Khushal <khushalsagar@chromium.org>
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Reviewed-by: Eric Karl <ericrk@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#572377}

TBR=backer@chromium.org,khushalsagar@chromium.org,piman@chromium.org,ericrk@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 854416
Change-Id: Ia8d34c966409fa209f8d75b74a2f1cdc253b979d
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/1127699Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572933}