Move ui/base/x/x11_error_tracker to base/x11.

base/base.gypi

Index: base/base.gypi
diff --git a/base/base.gypi b/base/base.gypi
index e30f85520acd4f4c0e6da361b1df8afd96ce03d5..86212083f093d8d3f536a674c91e64307ba0ec56 100644
--- a/base/base.gypi
+++ b/base/base.gypi
@@ -667,6 +667,9 @@
           'win/windows_version.h',
           'win/wrapped_window_proc.cc',
           'win/wrapped_window_proc.h',
+          'x11/x11_error_tracker.cc',
+          'x11/x11_error_tracker.h',
+          'x11/x11_error_tracker_gtk.cc',
         ],
         'conditions': [
           ['use_aura==1 and use_x11==1', {
@@ -909,6 +912,11 @@
               ['exclude', '^third_party/nspr/'],
             ],
           }],
+          ['<(toolkit_uses_gtk) == 1', {
+            'sources!': [
+              'x11/x11_error_tracker.cc',
+            ],
+          }],
         ],
       }],
     ],