Rename SVGAnimatedPropertyBase::SetBaseValueAsString

Rename SVGAnimatedPropertyBase::SetBaseValueAsString to
AttributeChanged, to reflect how it interacts with the system in general
(sets a new value based on an updated attribute string) - the counter-
part to this notifier being BaseValueChanged.

Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I55b42d7662c744d4d4d39b8ea0545d0318bcbeab
Reviewed-on: https://chromium-review.googlesource.com/1184844
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#585077}
10 files changed