Simplify SVGElement::ParseAttribute

There's no real reason to give 'tabindex' preferential treatment (not
anymore at least.) Just let it be handled by the common fall-through
code-path and flatten the structure of the code a bit.

Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I96e6c265aeb384fe1acc0b61378078bb3d06051c
Reviewed-on: https://chromium-review.googlesource.com/1179886
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584218}
1 file changed