third_party: Update to version 8 of remote_shell_protocol

components/exo/shell_surface.h

Index: components/exo/shell_surface.h
diff --git a/components/exo/shell_surface.h b/components/exo/shell_surface.h
index 631f2c7e9a2f071f83a6b740dd63b1b486a0b8da..525e7c2fee40b82ce8d15fece2762262df08470b 100644
--- a/components/exo/shell_surface.h
+++ b/components/exo/shell_surface.h
@@ -115,6 +115,9 @@ class ShellSurface : public SurfaceDelegate,
   // Set title for surface.
   void SetTitle(const base::string16& title);
 
+  // Sets the system modality.
+  void SetSystemModal(bool system_modal);
+
   // Sets the application ID for the window. The application ID identifies the
   // general class of applications to which the window belongs.
   static void SetApplicationId(aura::Window* window,