Migrate ExceptionCode ASSERTs in SVG to ASSERT_NO_EXCEPTION.
https://bugs.webkit.org/show_bug.cgi?id=109267

Reviewed by Jochen Eisinger.

The pattern:

    ExceptionCode ec = 0;
    methodThatGeneratesException(ec);
    ASSERT(!ec);

is more clearly and succinctly written as:

    methodThatGeneratesException(ASSERT_NO_EXCEPTION);

This patch replaces the occurances of the former in SVG code that never
touch 'ec' again with the latter. No change in behavior should result
from this refactoring.

* svg/SVGLength.cpp:
(WebCore::SVGLength::SVGLength):
(WebCore::SVGLength::setValue):
    This method checked the value of the ExceptionCode without first
    initializing it to 0. Now it initializes before doing potentially
    exception-generating work.
* rendering/style/SVGRenderStyle.h:
(WebCore::SVGRenderStyle::initialBaselineShiftValue):
(WebCore::SVGRenderStyle::initialKerning):
(WebCore::SVGRenderStyle::initialStrokeDashOffset):
(WebCore::SVGRenderStyle::initialStrokeWidth):
* svg/SVGAnimatedLength.cpp:
(WebCore::sharedSVGLength):
(WebCore::SVGAnimatedLengthAnimator::addAnimatedTypes):
(WebCore::SVGAnimatedLengthAnimator::calculateAnimatedValue):
* svg/SVGAnimatedLengthList.cpp:
(WebCore::SVGAnimatedLengthListAnimator::addAnimatedTypes):
(WebCore::SVGAnimatedLengthListAnimator::calculateAnimatedValue):
* svg/SVGTextContentElement.cpp:
(WebCore::SVGTextContentElement::textLengthAnimated):
* svg/animation/SVGSMILElement.cpp:
(WebCore::constructQualifiedName):
    Replace the above pattern with ASSERT_NO_EXCEPTION.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@142261 268f45cc-cd09-0410-ab3c-d52691b4dbfc