Disable zoom-in and zoom-out buttons in toolbar menu for a crashed page.

chrome/browser/ui/browser_commands.cc

Index: chrome/browser/ui/browser_commands.cc
diff --git a/chrome/browser/ui/browser_commands.cc b/chrome/browser/ui/browser_commands.cc
index e2bd5ce56ce78e40c54b0a6a1fc5eaca0b3e44b7..ff0d782850367031ebed78031a8bab2d075c7393 100644
--- a/chrome/browser/ui/browser_commands.cc
+++ b/chrome/browser/ui/browser_commands.cc
@@ -574,17 +574,25 @@ void CloseTab(Browser* browser) {
   browser->tab_strip_model()->CloseSelectedTabs();
 }
 
-bool CanZoomIn(content::WebContents* contents) {
-  ui_zoom::ZoomController* zoom_controller =
+int GetZoomPercent(content::WebContents* contents) {
+  int zoom = 100;
+  if (contents) {
+    auto zoom_controller =
       ui_zoom::ZoomController::FromWebContents(contents);
-  return zoom_controller->GetZoomPercent() != contents->GetMaximumZoomPercent();
+    if (zoom_controller)
+      zoom = zoom_controller->GetZoomPercent();
+  }
+  return zoom;
+}
+
+bool CanZoomIn(content::WebContents* contents) {
+  return contents && !contents->IsCrashed() &&
+      GetZoomPercent(contents) != contents->GetMaximumZoomPercent();
 }
 
 bool CanZoomOut(content::WebContents* contents) {
-  ui_zoom::ZoomController* zoom_controller =
-      ui_zoom::ZoomController::FromWebContents(contents);
-  return zoom_controller->GetZoomPercent() !=
-      contents->GetMinimumZoomPercent();
+  return contents && !contents->IsCrashed() &&
+      GetZoomPercent(contents) != contents->GetMinimumZoomPercent();
 }
 
 bool CanResetZoom(content::WebContents* contents) {