Consolidate webgl skip lines.
Consolidate webgl skip lines.

Of the non-skip lines, they were all flaky except for
webgl/conformance/attribs/gl-vertexattribpointer.html, which
is incorrectly missing a flaky timeout.

The skip lines were all redundant.

TBR=kbr@chromium.org

Review URL: https://codereview.chromium.org/14043011

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@149154 bbb929c8-8fbe-4397-9dbb-9b2b20218538

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk