cc: Remove RSLLMembershipWithScale test from DrMemory blacklist

Since we increased timeout for cc tests in 579189, this test should
pass.

BUG=460581
R=enne@chromium.org, danakj@chromium.org, vmpstr@chromium.org

Review-Url: https://codereview.chromium.org/2020903002
Cr-Commit-Position: refs/heads/master@{#405487}

tools/valgrind/gtest_exclude/cc_unittests.gtest-drmemory_win32.txt

@@ -18,9 +18,6 @@ LayerTreeHostTestReadyToActivateNonEmpty.*
 # http://crbug.com/430400
 PixelResourceTest*
 
-# https://crbug.com/460581
-LayerTreeHostPictureTestRSLLMembershipWithScale.RunMultiThread_DirectRenderer_ImplSidePaint
-
 # https://crbug.com/486619
 LayerTreeHostTestWillBeginImplFrameHasDidFinishImplFrame.RunSingleThread*