Explicitely unlock screen orientation when navigating.

BUG=162827

Review URL: https://codereview.chromium.org/582373003

Cr-Commit-Position: refs/heads/master@{#295692}

content/browser/screen_orientation/screen_orientation_dispatcher_host_impl.cc

@@ -5,6 +5,7 @@
 #include "content/browser/screen_orientation/screen_orientation_dispatcher_host_impl.h"
 
 #include "content/common/screen_orientation_messages.h"
+#include "content/public/browser/navigation_details.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
@@ -55,6 +56,13 @@ bool ScreenOrientationDispatcherHostImpl::OnMessageReceived(
   return handled;
 }
 
+void ScreenOrientationDispatcherHostImpl::DidNavigateMainFrame(
+    const LoadCommittedDetails& details, const FrameNavigateParams& params) {
+  if (!provider_ || details.is_in_page)
+    return;
+  provider_->UnlockOrientation();
+}
+
 RenderFrameHost*
 ScreenOrientationDispatcherHostImpl::GetRenderFrameHostForRequestID(
     int request_id) {

content/browser/screen_orientation/screen_orientation_dispatcher_host_impl.h

@@ -35,6 +35,8 @@ class CONTENT_EXPORT ScreenOrientationDispatcherHostImpl
   // WebContentsObserver:
   virtual bool OnMessageReceived(const IPC::Message&,
                                  RenderFrameHost* render_frame_host) OVERRIDE;
+  virtual void DidNavigateMainFrame(const LoadCommittedDetails& details,
+                                    const FrameNavigateParams& params) OVERRIDE;
 
  private:
   void OnLockRequest(RenderFrameHost* render_frame_host,