Added xdisplaycheck target to browser_tests deps

browser_tests require xdisplaycheck to run, but the target does not list
xdisplaycheck as a dependency.

R=mseaborn@chromium.org, vadimsh@chromium.org
BUG=359338

Review URL: https://codereview.chromium.org/305053002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274078 0039d316-1c4b-4281-b951-d872f2087c98

chrome/chrome_tests.gypi

@@ -2043,6 +2043,11 @@
             ['exclude', '^test/remoting'],
           ],
         }],
+        ['use_x11==1', {
+          'dependencies': [
+            '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
+          ],
+        }],
       ],  # conditions
     },  # target browser_tests
     {