Remove ASSERT(impl) from bindings for partial interface members

Per request of haraken@:
https://codereview.chromium.org/283083002/#msg8

R=haraken

Review URL: https://codereview.chromium.org/286083002

git-svn-id: svn://svn.chromium.org/blink/trunk@174245 bbb929c8-8fbe-4397-9dbb-9b2b20218538
rebaseline-o-matic shouldn't hang if git pull crashes.

Every once in a while, rebaseline-o-matic gets hung on a
detached head because git pull crashes and then the subsequent
git pulls fail. Instead, make sure to checkout the old
branch when git pull throws an error.

BUG=370499

Review URL: https://codereview.chromium.org/289873006

git-svn-id: svn://svn.chromium.org/blink/trunk@174246 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Do not generate EventTarget.cpp which is not used in the build.

Review URL: https://codereview.chromium.org/287663003

git-svn-id: svn://svn.chromium.org/blink/trunk@174247 bbb929c8-8fbe-4397-9dbb-9b2b20218538