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Now that we are using "pub list-package-dirs" to find the packages associated with a context, we no longer need to explicitly track the presence or absence of a "pubspec.yaml" file within the context. Note that we will have to watch the "pubspec.lock" file in order to decide when to re-run "pub list-package-dirs", but we'll do this using a different mechanism, since the decision of which file(s) to watch is the responsibility of pub, and communicated to us through the JSON output of "pub list-package-dirs". This will be addressed in a future CL. R=brianwilkerson@google.com Review URL: https://codereview.chromium.org//353453004 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@37620 260f80e4-7a28-3924-810f-c04153c831b5