DevTools: Compile InjectedScriptSource.js and InjectedScriptCanvasModuleSource.js together.

Since canvas module now depends on the main injected script we should
compile them together, and remove the corresponding @suppress jsdocs.

Also compiling the "unclosured" code reveals new warnings for some
reason, thus compiling this way seems to be more strict.

BUG=None
R=yurys@chromium.org

Review URL: https://codereview.chromium.org/18516004

git-svn-id: svn://svn.chromium.org/blink/trunk@153422 bbb929c8-8fbe-4397-9dbb-9b2b20218538