Suppress ScriptForbiddenScope in Document.cpp and FrameView.cpp in release mode

r178351 enabled ScriptForbiddenScope in release builds, then we hit a lot of crashes from real-world plugins (see the below bugs). We should suppress the ScriptForbiddenScopes in Document.cpp and FrameView.cpp in release builds.

BUG=395299,395081,395164

Review URL: https://codereview.chromium.org/403133002

git-svn-id: svn://svn.chromium.org/blink/trunk@178518 bbb929c8-8fbe-4397-9dbb-9b2b20218538