Add chrome/browser/apps/BUILD.gn and move Chrome-specific code there

apps/BUILD.gn

Index: apps/BUILD.gn
diff --git a/apps/BUILD.gn b/apps/BUILD.gn
index ff63d9409b11b9708803f5c46a37fe3f9f81cc9e..e83a7bf2714569a2e0470e8e86d8ee35a3fc8f03 100644
--- a/apps/BUILD.gn
+++ b/apps/BUILD.gn
@@ -17,10 +17,6 @@ static_library("apps") {
       "app_lifetime_monitor.h",
       "app_lifetime_monitor_factory.cc",
       "app_lifetime_monitor_factory.h",
-      "app_load_service.cc",
-      "app_load_service.h",
-      "app_load_service_factory.cc",
-      "app_load_service_factory.h",
       "app_restore_service.cc",
       "app_restore_service.h",
       "app_restore_service_factory.cc",
@@ -42,14 +38,17 @@ static_library("apps") {
 
     deps = [
       "//chrome/app/theme:theme_resources",
-      "//chrome/browser/extensions",
-      "//chrome/common/extensions/api",
-      "//components/web_modal",
+      "//components/keyed_service/content",
+      "//content/public/browser",
+      "//content/public/common",
+      "//extensions/common",
+      "//extensions/common/api",
       "//skia",
     ]
 
-    # TODO: This top level directory should not have an include cycle.
-    allow_circular_includes_from = [ "//chrome/browser/extensions" ]
+    if (is_chromeos) {
+      deps += [ "//components/user_manager" ]
+    }
   }
 
   if (toolkit_views) {
@@ -58,6 +57,7 @@ static_library("apps") {
       "ui/views/app_window_frame_view.h",
     ]
     deps += [
+      "//cc/paint",
       "//ui/strings",
       "//ui/views",
     ]