Handle OnBoundsChanged for fullscreen RWHV because it dosen't have WebContentsViewAura that calls S…

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index 6896797ea5ec633f904e12bd1372fc20f29ee11e..3028e2891ada668a26639498b92292b96bd85ffa 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -1277,8 +1277,11 @@ gfx::Size RenderWidgetHostViewAura::GetMinimumSize() const {
 
 void RenderWidgetHostViewAura::OnBoundsChanged(const gfx::Rect& old_bounds,
                                                const gfx::Rect& new_bounds) {
-  // We don't care about this one, we are always sized via SetSize() or
-  // SetBounds().
+  // We care about this only in fullscreen mode, where there is no
+  // WebContentsViewAura. We are sized via SetSize() or SetBounds() by
+  // WebContentsViewAura in other cases.
+  if (is_fullscreen_)
+    SetSize(new_bounds.size());
 }
 
 void RenderWidgetHostViewAura::OnFocus(aura::Window* old_focused_window) {