Mac: Properly put the NSURLs on the pasteboard when dragging from web content.
Mac: Properly put the NSURLs on the pasteboard when dragging from web content.

Don't use the Mozilla code which (a) wasn't designed for lazy writes, and (b) is weird and kind of broken for file URLs.

BUG=29911
TEST=Should be able to drag images (from a local web page) to Finder. Other drag-and-drop functionality (from web content) should continue to work as before.

Review URL: http://codereview.chromium.org/1223005

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@42945 0039d316-1c4b-4281-b951-d872f2087c98

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