GN: Only have one gfx_x11 target

ui/gfx/BUILD.gn

Index: ui/gfx/BUILD.gn
diff --git a/ui/gfx/BUILD.gn b/ui/gfx/BUILD.gn
index e2796a1b7ac1616ee156c6a5c72ad4a99755e638..e2fd0de19055f9d46c7ed36f8e9cf8120a36b123 100644
--- a/ui/gfx/BUILD.gn
+++ b/ui/gfx/BUILD.gn
@@ -336,7 +336,7 @@ component("gfx") {
 
   if (use_x11) {
     deps += [
-      ":gfx_x11",
+      "//ui/gfx/x",
     ]
   } else {
     sources -= [
@@ -418,28 +418,3 @@ if (is_android) {
     jni_package = "gfx"
   }
 }
-
-if (use_x11) {
-  component("gfx_x11") {
-    sources = [
-      "x/x11_atom_cache.cc",
-      "x/x11_atom_cache.h",
-      "x/x11_connection.cc",
-      "x/x11_connection.h",
-      "x/x11_error_tracker.cc",
-      "x/x11_error_tracker.h",
-      "x/x11_switches.cc",
-      "x/x11_switches.h",
-      "x/x11_types.cc",
-      "x/x11_types.h",
-    ]
-
-    defines = [ "GFX_IMPLEMENTATION" ]
-    configs += [ "//build/config/linux:x11" ]
-
-    deps = [
-      ":gfx_export",
-      "//base"
-    ]
-  }
-}