Send a resize message to renderer when exiting full screen in vr.

chrome/browser/android/vr_shell/vr_shell.cc

Index: chrome/browser/android/vr_shell/vr_shell.cc
diff --git a/chrome/browser/android/vr_shell/vr_shell.cc b/chrome/browser/android/vr_shell/vr_shell.cc
index ee4aa9843e6188d468b450677340af9e5b586d8b..6c72503b7e37beac72dc65027e51bdce47a8ae69 100644
--- a/chrome/browser/android/vr_shell/vr_shell.cc
+++ b/chrome/browser/android/vr_shell/vr_shell.cc
@@ -375,7 +375,7 @@ void VrShell::DoUiAction(const UiAction action) {
   switch (action) {
     case HISTORY_BACK:
       if (main_contents_->IsFullscreen()) {
-        main_contents_->ExitFullscreen(true /* will_cause_resize */);
+        main_contents_->ExitFullscreen(false);
       } else if (controller.CanGoBack()) {
         controller.GoBack();
       }