Remove unused declarations fro WebURLRequest

This change removes cookiesAllowed() and setCookiesAllowed()
whose bodies have been already removed before.

TEST=none
BUG=none
R=abarth@chromium.org, tkent@chromium.org

Review URL: https://codereview.chromium.org/227693004

git-svn-id: svn://svn.chromium.org/blink/trunk@170999 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Implement WebView history api, remove direct history calls within blink.

WebView's history api is a temporary shim to enable moving HistoryController to chromium's content/ layer. With this patch, HistoryController is implemented in blink, but all calls to it are generated from content/. This is step 3 of 5 in http://crbug.com/357327.

BUG=357327

Review URL: https://codereview.chromium.org/217363005

git-svn-id: svn://svn.chromium.org/blink/trunk@171000 bbb929c8-8fbe-4397-9dbb-9b2b20218538