Revert "Disable failing blink_perf.canvas story on 5, 5X, and 5X webview"

This reverts commit 250fb9b3.

Reason for revert: The bug which caused the failure has been fixed.

Original change's description:
> Disable failing blink_perf.canvas story on 5, 5X, and 5X webview
> 
> TBR=ashleymarie@chromium.org
> NOTRY=true
> 
> Bug: 812615
> Change-Id: Ib89c68b30e3b0f33eded7e35572dd71208d60a4d
> Reviewed-on: https://chromium-review.googlesource.com/922788
> Reviewed-by: Ashley Enstad <ashleymarie@chromium.org>
> Reviewed-by: Charlie Andrews <charliea@chromium.org>
> Commit-Queue: Charlie Andrews <charliea@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#537309}

TBR=charliea@chromium.org,ashleymarie@chromium.org

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

Bug: 812615
Change-Id: I2cb330d935fdf42d41c00e05637e3dee9e22989f
Reviewed-on: https://chromium-review.googlesource.com/927202Reviewed-by: Khushal <khushalsagar@chromium.org>
Reviewed-by: Ashley Enstad <ashleymarie@chromium.org>
Commit-Queue: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537880}

tools/perf/expectations.config

@@ -24,9 +24,6 @@ crbug.com/784540 [ Nexus_5X ] blink_perf.canvas/draw-static-canvas-2d-to-hw-acce
 crbug.com/784540 [ Nexus_5 ] blink_perf.canvas/draw-dynamic-canvas-2d-to-hw-accelerated-canvas-2d.html [ Skip ]
 crbug.com/784540 [ Nexus_5X ] blink_perf.canvas/draw-dynamic-canvas-2d-to-hw-accelerated-canvas-2d.html [ Skip ]
 crbug.com/738453 [ Nexus_6 ] blink_perf.canvas/putImageData.html [ Skip ]
-crbug.com/812615 [ Nexus_5 ] blink_perf.canvas/draw-dynamic-webgl-to-hw-accelerated-canvas-2d.html [ Skip ]
-crbug.com/812615 [ Nexus_5X ] blink_perf.canvas/draw-dynamic-webgl-to-hw-accelerated-canvas-2d.html [ Skip ]
-crbug.com/812615 [ Nexus5X_Webview ] blink_perf.canvas/draw-dynamic-webgl-to-hw-accelerated-canvas-2d.html [ Skip ]
 
 # Benchmark: blink_perf.events
 crbug.com/799184 [ Cherry_Mobile_Android_One ] blink_perf.events/EventsDispatchingInShadowTrees.html [ Skip ]