Use WebViewClient instead of BlinkPlatform for screen lock.

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index 94ab8cc45b04f89c0276867bc1c142168416aa00..b40c580a1aa862379927d389513d6421f3339ea6 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -85,6 +85,7 @@
 #include "modules/geolocation/GeolocationController.h"
 #include "modules/indexeddb/InspectorIndexedDBAgent.h"
 #include "modules/push_messaging/PushController.h"
+#include "modules/screen_orientation/ScreenOrientationController.h"
 #include "platform/ContextMenu.h"
 #include "platform/ContextMenuItem.h"
 #include "platform/Cursor.h"
@@ -434,6 +435,8 @@ WebViewImpl::WebViewImpl(WebViewClient* client)
         providePushControllerTo(*m_page, m_client->webPushClient());
         setDeviceScaleFactor(m_client->screenInfo().deviceScaleFactor);
         setVisibilityState(m_client->visibilityState(), true);
+        if (RuntimeEnabledFeatures::screenOrientationEnabled())
+            ScreenOrientationController::provideTo(*m_page, m_client->webScreenOrientationClient());
     }
 
     m_inspectorSettingsMap = adoptPtr(new SettingsMap);