Fix GN ui_unittests dependency for Chrome OS.

This CL replaces the mistyped //chromeos/resources and
//chromeos/strings dependency (introduced by r302142) with
//ui/chromeos/resources and //ui/chromeos/strings.

BUG=None
TEST=Run `gn gen --args='os="chromeos" ...`

Review URL: https://codereview.chromium.org/698033002

Cr-Commit-Position: refs/heads/master@{#302450}

ui/base/BUILD.gn

@@ -896,11 +896,11 @@ test("ui_unittests") {
     ]
     deps += [
       "//chromeos",
-      "//chromeos/resources",
-      "//chromeos/strings",
       "//ui/aura:test_support",
-      "//ui/events:gesture_detection",
+      "//ui/chromeos/resources",
+      "//ui/chromeos/strings",
       "//ui/chromeos:ui_chromeos",
+      "//ui/events:gesture_detection",
       "//ui/message_center:message_center",
     ]
   }