Exit HTML Fullscreen when browser fullscreen is active.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 4f90143f55dfc95e943d980471fbb406fcd2b98c..5701e3392ea08d516ece375ced2a48aee2055052 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -1479,6 +1479,17 @@ void WebContentsImpl::ExitFullscreenMode() {
   if (delegate_)
     delegate_->ExitFullscreenModeForTab(this);
 
+  // Ensure web contents exit fullscreen state by sending a resize message,
+  // which includes the fullscreen state. This is required for the situation
+  // of the browser moving the view into a fullscreen state "browser fullscreen"
+  // and then the contents entering "tab fullscreen". Exiting the contents
+  // "tab fullscreen" then won't have the side effect of the view resizing,
+  // hence the explicit call here is required.
+  if (RenderWidgetHostView* rwh_view = GetRenderWidgetHostView()) {
+    if (RenderWidgetHost* render_widget_host = rwh_view->GetRenderWidgetHost())
+      render_widget_host->WasResized();
+  }
+
   FOR_EACH_OBSERVER(WebContentsObserver,
                     observers_,
                     DidToggleFullscreenModeForTab(IsFullscreenForCurrentTab()));