Refactoring: An argument of functions related to focus/blur events should be Element* or EventTarget*.

We should not use PassRefPtr<> because we don't move ownership of
objects when we call these functions.

BUG=258763

Review URL: https://chromiumcodereview.appspot.com/20020004

git-svn-id: svn://svn.chromium.org/blink/trunk@154864 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Have const StyleResolverState return const RenderStyle

Change StyleResolverState to return const RenderStyle pointers if
called using a const StyleResolverState pointer.

BUG=237268
R=dglazkov@chromium.org

Review URL: https://chromiumcodereview.appspot.com/20112002

git-svn-id: svn://svn.chromium.org/blink/trunk@154865 bbb929c8-8fbe-4397-9dbb-9b2b20218538