Use SVGLength-references in the SVGLengthContext API

Convert all the PassRefPtrWillBeRawPtr<SVGLength>-typed arguments to
const SVGLength&. This avoids unnecessary ref-count churn (the caller will
always own a reference anyway). As a side-effect footprint is reduced by
~2k. (resolveRectangle<T> can now be properly inlined and other methods
shrink a bit.)

Review URL: https://codereview.chromium.org/921823002

git-svn-id: svn://svn.chromium.org/blink/trunk@190070 bbb929c8-8fbe-4397-9dbb-9b2b20218538
5 files changed