Check WebContents* in LocationBarView::ShowPageInfoDialog

Bug: 828704
Change-Id: I1263e0bc2520b7b5f110ac2ae0ac92e3db8e2fd9
Reviewed-on: https://chromium-review.googlesource.com/999310Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Brandon Tolsch <btolsch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551484}

chrome/browser/ui/views/location_bar/location_icon_view.cc

@@ -72,7 +72,10 @@ SkColor LocationIconView::GetTextColor() const {
 }
 
 bool LocationIconView::ShowBubble(const ui::Event& event) {
-  return location_bar_->ShowPageInfoDialog(location_bar_->GetWebContents());
+  auto* contents = location_bar_->GetWebContents();
+  if (!contents)
+    return false;
+  return location_bar_->ShowPageInfoDialog(contents);
 }
 
 void LocationIconView::GetAccessibleNodeData(ui::AXNodeData* node_data) {