SVG: Remove&inline |invokeMethodOnAllTargetProperties|

|invokeMethodOnAllTargetProperties| is now only used from |endAnimation|.
The code is more readable when inlined.

BUG=378670

Review URL: https://codereview.chromium.org/305033004

git-svn-id: svn://svn.chromium.org/blink/trunk@175125 bbb929c8-8fbe-4397-9dbb-9b2b20218538