Move parseDeclaration() and clear() to MutableStylePropertySet.

...and remove ASSERT(isMutable()) from the function bodies.

In svg/SVGFontFaceElement.cpp use clear() directly instead of taking
an empty string through the CSS parser.

This is a backport from WebKit r148397. Patch by Andreas Kling reviewed by Anders Carlsson.

R=apavlov@chromium.org

Review URL: https://codereview.chromium.org/16007002

git-svn-id: svn://svn.chromium.org/blink/trunk@151103 bbb929c8-8fbe-4397-9dbb-9b2b20218538
4 files changed