When creating a background contents, also adopt the session storage namespace.

We already told the RenderView to use this, so we need to adopt it on
the browser side as well.

BUG=269449
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Review URL: https://chromiumcodereview.appspot.com/22854010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@217553 0039d316-1c4b-4281-b951-d872f2087c98
10 files changed