untangle pango usage from use_x11 and OS==linux

ui/ui_unittests.gypi

Index: ui/ui_unittests.gypi
diff --git a/ui/ui_unittests.gypi b/ui/ui_unittests.gypi
index 27a2a3ad980eaaaefe1cfba6e4ca8cd33a6a47b4..a66dad6a4d414bab3ab9854aff6ec8ffb03c7431 100644
--- a/ui/ui_unittests.gypi
+++ b/ui/ui_unittests.gypi
@@ -209,11 +209,6 @@
           # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
           'msvs_disabled_warnings': [ 4267, ],
         }],
-        ['OS == "linux"', {
-          'sources': [
-            'gfx/platform_font_pango_unittest.cc',
-          ],
-        }],
         ['OS == "linux" and toolkit_views==1', {
           'sources': [
             'base/x/events_x_unittest.cc',
@@ -235,10 +230,13 @@
             'base/strings/ui_strings.gyp:ui_unittest_strings',
           ],
         }],
-        ['use_glib == 1', {
+        ['use_pango == 1', {
           'dependencies': [
             '../build/linux/system.gyp:pangocairo',
           ],
+          'sources': [
+            'gfx/platform_font_pango_unittest.cc',
+          ],
           'conditions': [
             ['linux_use_tcmalloc==1', {
                'dependencies': [