Revert "remove webgl suppression for gl-bindAttribLocation-aliasing-inactive.html"

This reverts commit 4c002763.

Reason for revert: Causing CQ failures.

Original change's description:
> remove webgl suppression for gl-bindAttribLocation-aliasing-inactive.html
> 
> TBR=kbr@chromium.org
> 
> Bug: 829541
> Change-Id: I6b6e481ec11abf895debe2cf3cfe44e812b2b436
> Reviewed-on: https://chromium-review.googlesource.com/1023715
> Reviewed-by: Kai Ninomiya <kainino@chromium.org>
> Commit-Queue: Kai Ninomiya <kainino@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#552732}

TBR=kainino@chromium.org

Change-Id: Id155fd5d4d80143a8880ce6a53b7d993da4bab4c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 829541, 835967
Reviewed-on: https://chromium-review.googlesource.com/1024718Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552825}

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

@@ -65,6 +65,9 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
     self.Fail('conformance2/glsl3/tricky-loop-conditions.html', bug=483282)
     self.Fail('conformance2/glsl3/array-length-side-effects.html',
         bug=2142) # angle bug ID
+    self.Fail('conformance2/attribs/' +
+        'gl-bindAttribLocation-aliasing-inactive.html',
+        bug=829541)
 
     # This test needs to be rewritten to measure its expected
     # performance; it's currently too flaky even on release bots.