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This prepares for removing the WebNode originating_node parameter from
WebFrameLoader::decidePolicyForNavigation() by adding overrides that don't
use the parameter. After Blink moves over to calling the node-less version of
these functions and is rolled into Chromium, the WebNode overrides can be deleted.

Review URL: https://chromiumcodereview.appspot.com/14330009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@195211 0039d316-1c4b-4281-b951-d872f2087c98