desktop linux aura: Fix event/capture focus after dragging a window.

ui/aura/root_window.cc

Index: ui/aura/root_window.cc
diff --git a/ui/aura/root_window.cc b/ui/aura/root_window.cc
index 8e1cef986634b8eb7d67d2afd2ce11550ab70cef..d447b13a59a85ac6272288f0010494d031dfff28 100644
--- a/ui/aura/root_window.cc
+++ b/ui/aura/root_window.cc
@@ -924,12 +924,18 @@ bool RootWindow::OnHostTouchEvent(ui::TouchEvent* event) {
   return ProcessGestures(gestures.get()) ? true : handled;
 }
 
-void RootWindow::OnHostLostCapture() {
+void RootWindow::OnHostLostWindowCapture() {
   Window* capture_window = client::GetCaptureWindow(this);
   if (capture_window && capture_window->GetRootWindow() == this)
     capture_window->ReleaseCapture();
 }
 
+void RootWindow::OnHostLostMouseGrab() {
+  mouse_pressed_handler_ = NULL;
+  mouse_moved_handler_ = NULL;
+  mouse_event_dispatch_target_ = NULL;
+}
+
 void RootWindow::OnHostPaint() {
   Draw();
 }