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Supporting deprecated Dictionary enables us to do step-by-step refactoring.

Note for tests:
Since Dictionary instances cannot outlive an event loop, DictionaryTest
stores its properties intead of instances itself. Added
getDictionaryMemberProperties() to retrieve these properties.

BUG=524357

Review URL: https://codereview.chromium.org/1316833003

git-svn-id: svn://svn.chromium.org/blink/trunk@201199 bbb929c8-8fbe-4397-9dbb-9b2b20218538