gn: Don't depend on osmesa.

ui/events/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//ui/ozone/ozone.gni")
 
 if (is_android) {
@@ skipping 386 matching lines @@
       "//third_party/WebKit/public:blink_headers",
       "//ui/events/blink",
       "//ui/events/devices/mojo:test_interfaces",
       "//ui/events/gestures/blink",
       "//ui/events/ipc",
       "//ui/events/mojo:test_interfaces",
       "//ui/gfx/ipc/geometry",
     ]
   }
 
-  data_deps = [
-    "//third_party/mesa:osmesa",
-  ]
+  if (!is_android && !is_ios) {
+    data_deps = [
+      "//third_party/mesa:osmesa",
+    ]
+  }
 
   if (use_x11) {
     sources += [
       "devices/x11/device_data_manager_x11_unittest.cc",
       "x/events_x_unittest.cc",
     ]
     configs += [ "//build/config/linux:x11" ]
     deps += [
       "//ui/events/devices/x11",
       "//ui/events/x",
@@ skipping 48 matching lines @@
   generate_jar_jni("motionevent_jni_headers") {
     jni_package = "ui"
     classes = [ "android/view/MotionEvent.class" ]
   }
 
   generate_jar_jni("keyevent_jni_headers") {
     jni_package = "ui"
     classes = [ "android/view/KeyEvent.class" ]
   }
 }