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This patch handled opening of already  blocked popups,
here it creates the webcontents and load the url in the
webcontents and invokes AddNewContents() of
ChromeWebContentsDelegateAndroid class so that it will notify
the application to add a new tab.

BUG=

Review URL: https://codereview.chromium.org/368983004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284015 0039d316-1c4b-4281-b951-d872f2087c98