Auto-rebaseline for r174041

http://src.chromium.org/viewvc/blink?view=revision&revision=174041

BUG=361729
TBR=enne@chromium.org

Review URL: https://codereview.chromium.org/292443005

git-svn-id: svn://svn.chromium.org/blink/trunk@174129 bbb929c8-8fbe-4397-9dbb-9b2b20218538
IDL: move overloaded constructors to spec algorithm

This finishes implementing the spec overload algorithm.

It's mostly just switching constructors to using the method code.

7 interfaces have overloaded constructors:
Animation
FontFace
ImageData
MediaStream
Path2D
URL
WebSocket

Only new feature is a check for Dictionary, in Animation.

Also includes some easy cleanup.

R=haraken
BUG=293561

Review URL: https://codereview.chromium.org/288183002

git-svn-id: svn://svn.chromium.org/blink/trunk@174130 bbb929c8-8fbe-4397-9dbb-9b2b20218538