[CSS Shapes] Remove unnecessarily complex template from ShapeInfo classes

[CSS Shapes] Remove unnecessarily complex template from ShapeInfo classes
https://bugs.webkit.org/show_bug.cgi?id=121213

Reviewed by Darin Adler.

These classes were trying to be way too clever, and as a result were
hard to read and hard to debug. Replace the complex templated method
calls with virtual methods to make these classes much easier to
understand and maintain.

No new tests, no behavior change.

* rendering/shapes/ShapeInfo.cpp:
(WebCore::::computedShape):
(WebCore::::computeSegmentsForLine):
* rendering/shapes/ShapeInfo.h:
* rendering/shapes/ShapeInsideInfo.cpp:
(WebCore::ShapeInsideInfo::getShapeValue):
* rendering/shapes/ShapeInsideInfo.h:
(WebCore::ShapeInsideInfo::computeSegmentsForLine):
(WebCore::ShapeInsideInfo::ShapeInsideInfo):
* rendering/shapes/ShapeOutsideInfo.cpp:
(WebCore::ShapeOutsideInfo::computeSegmentsForLine):
(WebCore::ShapeOutsideInfo::getShapeValue):
* rendering/shapes/ShapeOutsideInfo.h:
(WebCore::ShapeOutsideInfo::ShapeOutsideInfo):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@155627 268f45cc-cd09-0410-ab3c-d52691b4dbfc