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Fix the HTML5 drag and drop demos at http://www.w3schools.com/html/tryit.asp?filename=tryhtml5_draganddrop and http://html5demos.com/drag on Linux and CrOS

This CL makes the behavior of OSExchangeData::Provider::SetString() match that of Windows on Linux and CrOS

This CL also changes the string which is dragged out of the omnibox on Linux and CrOS to match the string which is dragged out from the omnibox on Windows.
On Linux and CrOS, with this CL, the dragged out string for URLs no longer includes 'http://' if 'http://' is not visible in the omnibox. For instance, if the user has navigated to 'www.random.org', the dragged out string is 'http://www.random.org' without this CL and 'www.random.org' with this CL.

BUG=355390
TEST=OSExchangeDataTest.URLAndString

Review URL: https://codereview.chromium.org/208313009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282529 0039d316-1c4b-4281-b951-d872f2087c98