Show the filebrowse ui rather than the download shelf in chromeos.

This cl displays the filebrowse ui rather than download shelf for
downloads in chrom(e|ium) os. It conditionally replaces (with
preprocessor macros) the Browser::OnStartDownload method to do this.

The cl adds a static FileBrowseUI::OpenPopup(profile, hashArgument),
which opens the file browse ui and passes it the provided hash argument.
This is invoked directly from Browser::OnStartDownload. The
USBMountObserver code was changed to call this static method, rather
than open the popup by hand as it had been doing.

I'm not sure about ownership of the Browser* returned by OpenPopup, but
based on other code in the tree I assume chrome will deal with freeing
it when appropriate.

Before this change, USBMountObserver would add the window to registrar_
*before* showing it. Now that FileBrowseUI::OpenPopup returns a which
which is already visible, this is no longer the case. I assume this
won't be a problem.

Commit this for rginda.
Original review: http://codereview.chromium.org/555167

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/564022

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@38222 0039d316-1c4b-4281-b951-d872f2087c98

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