Remove GPU service dependency on services/ui/common.

All of that code is UI Service specific. There's no reason GPU Service should
depend on it. Before this change, services/ui/common was getting pulled into
Mac and Android builds.

BUG=NONE

Review-Url: https://codereview.chromium.org/2976923002
Cr-Commit-Position: refs/heads/master@{#486234}

services/ui/gpu/DEPS

@@ -11,7 +11,6 @@ include_rules = [
 
 specific_include_rules = {
   "gpu_main.*": [
-    "+services/ui/common",
     "+services/ui/surfaces",
   ]
 }

services/ui/public/cpp/gpu/BUILD.gn

@@ -47,7 +47,6 @@ source_set("internal") {
     "//gpu/skia_bindings",
     "//mojo/public/cpp/system",
     "//services/service_manager/public/cpp",
-    "//services/ui/common:mus_common",
     "//services/ui/public/interfaces",
   ]
 }

services/ui/public/cpp/gpu/DEPS

+include_rules = [
+  "-services/ui/common",
+]