Mojo EDK -> Core: ash, chrome, mash, ui

Moves dependencies from mojo/edk to mojo/core within the following
top-level directories: ash, chrome, mash, and ui

All mechanical changes, hence TBR(s).

TBR=sky@chromium.org

Bug: None
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:linux_vr;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I7fb3cca9e08ef42edc06be5b78ee10a359f4a703
Reviewed-on: https://chromium-review.googlesource.com/1126408
Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572634}

diff --git a/ui/aura/BUILD.gn b/ui/aura/BUILD.gn
index 9d09a03..ef79ede 100644
--- a/ui/aura/BUILD.gn
+++ b/ui/aura/BUILD.gn

@@ -401,7 +401,7 @@
     "//base/test:test_support",
     "//cc/mojo_embedder",
     "//components/viz/client",
-    "//mojo/edk",
+    "//mojo/core/embedder",
     "//net",
     "//services/ui/common:task_runner_test_base",
     "//services/ui/public/cpp",