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The rename is needed to avoid a naming collision after changing from
Blink to Chromium naming style.  Right now we have a |DocumentState|
type and a |documentState| accessor method (differing by case of the
first character); after a naive rename by the rewrite_to_chrome_style
tool we would end up with |DocumentState| being the name of both the
type and the accessor method (with both living in the same namespace).

Prepending a "get" prefix to the name of the accessor method is the
workaround that fits into the guidance on the recommended
post-Blink-to-Chromium-rename style suggested by esprehn@ in
https://crbug.com/582312#c17:
- Getters favor not using "Get", ex. FirstChild()
- Unless the type name conflicts, in which case you can either rename
  the type if it's easy and makes sense, or add "Get", ex. GetContext().

BUG=582312
TBR=creis@chromium.org

Review-Url: https://codereview.chromium.org/2569883002
Cr-Commit-Position: refs/heads/master@{#437995}