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 f4166fdee7957002e129ac47547994c94aaf8f9e..ec28a4e2d251ecb9ce65359b4bbdf7dfa95c0806 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -644,6 +644,7 @@ 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",
@@ -1333,7 +1334,6 @@ 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",