[ios clean] Dismisses ToolsMenu on Layout changes.

ios/clean/chrome/browser/ui/toolbar/toolbar_view_controller.mm

Index: ios/clean/chrome/browser/ui/toolbar/toolbar_view_controller.mm
diff --git a/ios/clean/chrome/browser/ui/toolbar/toolbar_view_controller.mm b/ios/clean/chrome/browser/ui/toolbar/toolbar_view_controller.mm
index 48003841e5e842087ebc234347379bafe143ab22..038bf9d2a9724b0e1cf2d82a251a31965bbc6b5d 100644
--- a/ios/clean/chrome/browser/ui/toolbar/toolbar_view_controller.mm
+++ b/ios/clean/chrome/browser/ui/toolbar/toolbar_view_controller.mm
@@ -59,6 +59,8 @@ CGFloat kHorizontalMargin = 8.0f;
   return self;
 }
 
+#pragma mark - View lifecyle
+
 - (void)viewDidLoad {
   self.view.backgroundColor = [UIColor lightGrayColor];
 
@@ -94,6 +96,14 @@ CGFloat kHorizontalMargin = 8.0f;
   ]];
 }
 
+- (void)viewWillTransitionToSize:(CGSize)size
+       withTransitionCoordinator:
+           (id<UIViewControllerTransitionCoordinator>)coordinator {
+  // We need to dismiss the ToolsMenu everytime the Toolbar frame changes
+  // (e.g. Size changes, rotation changes, etc.)
+  [self.dispatcher closeToolsMenu];
+}
+
 #pragma mark - Components Setup
 
 - (void)setUpToolbarButtons {