Revert of gpu: Add CHROMIUM_sync_query extension.

gpu/command_buffer/service/feature_info.cc

Index: gpu/command_buffer/service/feature_info.cc
diff --git a/gpu/command_buffer/service/feature_info.cc b/gpu/command_buffer/service/feature_info.cc
index 857b73770f5412596686b3e3ea3c8e09e8a26fe0..66e6a54eaf159cf2bbea2df0e026c8351eba4f2e 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -103,7 +103,6 @@
     : chromium_color_buffer_float_rgba(false),
       chromium_color_buffer_float_rgb(false),
       chromium_framebuffer_multisample(false),
-      chromium_sync_query(false),
       use_core_framebuffer_multisample(false),
       multisampled_render_to_texture(false),
       use_img_for_multisampled_render_to_texture(false),
@@ -778,11 +777,6 @@
     AddExtensionString("GL_EXT_discard_framebuffer");
     feature_flags_.ext_discard_framebuffer = true;
   }
-
-  if (ui_gl_fence_works) {
-    AddExtensionString("GL_CHROMIUM_sync_query");
-    feature_flags_.chromium_sync_query = true;
-  }
 }
 
 void FeatureInfo::AddExtensionString(const std::string& str) {