Mojo-ify implementation of screen orientation locking/unlocking.

content/test/BUILD.gn

Index: content/test/BUILD.gn
diff --git a/content/test/BUILD.gn b/content/test/BUILD.gn
index 97f3c04d3d212c9bbe5b71a22a939ef28420e8c7..7a465f4be05300700a985999ba0c56e05dda59c1 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -637,6 +637,7 @@ test("content_browsertests") {
     "../renderer/render_view_browsertest.cc",
     "../renderer/render_view_browsertest_mac.mm",
     "../renderer/render_widget_browsertest.cc",
+    "../renderer/screen_orientation/screen_orientation_dispatcher_browsertest.cc",
     "../renderer/visual_state_browsertest.cc",
     "../renderer/webclipboard_impl_browsertest.cc",
     "../test/browser_test_utils_browsertest.cc",
@@ -1320,7 +1321,6 @@ test("content_unittests") {
     "../renderer/render_thread_impl_unittest.cc",
     "../renderer/render_widget_unittest.cc",
     "../renderer/scheduler/resource_dispatch_throttler_unittest.cc",
-    "../renderer/screen_orientation/screen_orientation_dispatcher_unittest.cc",
     "../renderer/skia_benchmarking_extension_unittest.cc",
     "fileapi_test_file_set.cc",
     "fileapi_test_file_set.h",