Revert 261559 "Create new app_shell.gyp for app_shell targets."

> Create new app_shell.gyp for app_shell targets.
> 
> This moves app_shell GYP entries from a chrome.gyp include into
> a new apps/shell/app_shell.gyp.
> 
> It also breaks down dependencies with more granularity and separates
> temporary, undesirable app_shell_lib dependencies from acceptable ones.
> 
> BUG=359678
> TBR=yoz@chromium.org for extensions.gyp
> 
> Review URL: https://codereview.chromium.org/223613005

TBR=rockot@chromium.org

Review URL: https://codereview.chromium.org/224963002

git-svn-id: http://src.chromium.org/svn/trunk/src/build@261595 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

all.gyp

@@ -223,11 +223,6 @@
             '../google_apis/gcm/gcm.gyp:*',
           ],
         }],
-        ['chromeos==1 or (OS=="linux" and use_aura==1) or (OS=="win" and use_aura==1)', {
-          'dependencies': [
-            '../apps/shell/app_shell.gyp:*',
-          ],
-        }],
       ],
     }, # target_name: All
     {