remove webkit.gyp (and the test_shell target) and update affected targets

remove webkit.gyp (and the test_shell target) and update affected targets       
                                                                                
We had some old dummy targets left over in webkit.gyp that were used when       
we had to jump through hoops to build webkit-related targets. We don't need     
these any more.                                                                 
                                                                                
We also don't need the dummy test_shell target, as no builder should be         
trying to build test_shell directly at this point.                              
                                                                                
R=darin@chromium.org, jamesr@chromium.org
BUG=247105
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=204565

[jamesr, 2013-06-05 19:42:18]

lgtm

[Dirk Pranke, 2013-06-06 00:41:08]

darin, get I get approval to delete the rest of test_shell :) ?

[darin (slow to review), 2013-06-06 07:44:14]

On 2013/06/06 00:41:08, Dirk Pranke wrote:
> darin, get I get approval to delete the rest of test_shell :) ?

Yes, I approve of deleting all of test_shell.

[darin (slow to review), 2013-06-06 07:44:28]

LGTM

[Dirk Pranke, 2013-06-06 20:05:57]

Committed patchset #3 manually as r204565 (presubmit successful).