[ScreenOrientation] Hide ScreenOrientationProvider inside WebContentsImpl.

content/browser/BUILD.gn

Index: content/browser/BUILD.gn
diff --git a/content/browser/BUILD.gn b/content/browser/BUILD.gn
index ee3c5e63a2f14fb51028518b0f4275648210b845..a905c018e866bfd6e73a60bea3356d8261099261 100644
--- a/content/browser/BUILD.gn
+++ b/content/browser/BUILD.gn
@@ -76,6 +76,7 @@ source_set("browser") {
     "//device/geolocation/public/interfaces",
     "//device/nfc:mojo_bindings",
     "//device/power_save_blocker",
+    "//device/screen_orientation/public/interfaces",
     "//device/sensors",
     "//device/vibration",
     "//device/vr",
@@ -1210,6 +1211,8 @@ source_set("browser") {
     "resource_context_impl.h",
     "screen_orientation/screen_orientation_delegate_win.cc",
     "screen_orientation/screen_orientation_delegate_win.h",
+    "screen_orientation/screen_orientation_provider.cc",
+    "screen_orientation/screen_orientation_provider.h",
     "service_manager/merge_dictionary.cc",
     "service_manager/merge_dictionary.h",
     "service_manager/service_manager_context.cc",
@@ -1799,7 +1802,6 @@ source_set("browser") {
     deps -= [ "//device/battery" ]
     deps += [
       "//content/public/android:jni",
-      "//device/screen_orientation/public/interfaces",
       "//media",
       "//media/capture/content/android",
       "//media/capture/video/android",