DevTools: Provide methods for getting scripts by sourceURL from DebuggerModel fast.
DevTools: Provide methods for getting scripts by sourceURL from DebuggerModel fast.

We need these methods for getting fallback content for resources evicted from memory cache.

TBR=pfeldman@chromium.org

Review URL: https://chromiumcodereview.appspot.com/17090004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@152465 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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