cleanup to Value - fix for StringEscapesTest Motivation of this change was cleaning up value.dart.  This also led to finally handling parsing and escaping string literals in a rational way - which accidentally fixed a test.  This is intended to setup a future change that can simplify EvaluatedValue hopefully dramatically.  Changes to await were required due to refactoring of tree.
cleanup to Value - fix for StringEscapesTest
Motivation of this change was cleaning up value.dart.  This also led to finally handling parsing and escaping string literals in a rational way - which accidentally fixed a test.  This is intended to setup a future change that can simplify EvaluatedValue hopefully dramatically.  Changes to await were required due to refactoring of tree.

Review URL: http://codereview.chromium.org//9121025

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@3067 260f80e4-7a28-3924-810f-c04153c831b5

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