Attempt 2 at : Makes tests either use mock compositor or mock

chrome/chrome_tests.gypi

Index: chrome/chrome_tests.gypi
diff --git a/chrome/chrome_tests.gypi b/chrome/chrome_tests.gypi
index fe07a05d55513c1bc71f48548e20601cfca15959..b6f5713a27c7d7f2eb713958d508265c6d82e79e 100644
--- a/chrome/chrome_tests.gypi
+++ b/chrome/chrome_tests.gypi
@@ -65,7 +65,6 @@
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
         '../third_party/leveldatabase/leveldatabase.gyp:leveldatabase',
-        '../ui/gfx/compositor/compositor.gyp:test_compositor',
       ],
       'export_dependent_settings': [
         'renderer',
@@ -278,6 +277,11 @@
             ['exclude', 'test/base/ui_test_utils_win.cc'],
           ],
         }],
+        ['use_webkit_compositor==0', {
+          'dependencies': [
+            '../ui/gfx/compositor/compositor.gyp:test_compositor',
+          ],
+        }],
       ],
     },
     {