DevTools: turn on strict mode for InjectedScriptSource.js
DevTools: turn on strict mode for InjectedScriptSource.js

I cannot do the same for InjectedScriptCanvasModuleSource.js as it uses arguments.callee in many places.

BUG=None

Review URL: https://codereview.chromium.org/760283002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@186129 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs