Implements the "Set to default" button on the zoom bubble.

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

Index: chrome/browser/ui/views/location_bar/location_bar_view.cc
diff --git a/chrome/browser/ui/views/location_bar/location_bar_view.cc b/chrome/browser/ui/views/location_bar/location_bar_view.cc
index 424f5c5e50ca62297b50c809cf333cb25e92f917..7f5a8c13dfb28bcc48a78be1777edeae39b2cff9 100644
--- a/chrome/browser/ui/views/location_bar/location_bar_view.cc
+++ b/chrome/browser/ui/views/location_bar/location_bar_view.cc
@@ -270,7 +270,7 @@ void LocationBarView::Init(views::View* popup_parent_view) {
     content_blocked_view->SetVisible(false);
   }
 
-  zoom_view_ = new ZoomView(model_);
+  zoom_view_ = new ZoomView(model_, delegate_);
   AddChildView(zoom_view_);
 
   if (extensions::switch_utils::IsActionBoxEnabled()) {
@@ -515,7 +515,7 @@ void LocationBarView::SetZoomIconState(
 }
 
 void LocationBarView::ShowZoomBubble(int zoom_percent) {
-  ZoomBubbleView::ShowBubble(zoom_view_, zoom_percent, true);
+  ZoomBubbleView::ShowBubble(zoom_view_, GetTabContents(), true);
 }
 
 void LocationBarView::ShowChromeToMobileBubble() {
@@ -1045,7 +1045,7 @@ void LocationBarView::OnSetFocus() {
 }
 
 SkBitmap LocationBarView::GetFavicon() const {
-  return delegate_->GetTabContents()->favicon_tab_helper()->GetFavicon();
+  return GetTabContents()->favicon_tab_helper()->GetFavicon();
 }
 
 string16 LocationBarView::GetTitle() const {
@@ -1272,7 +1272,7 @@ void LocationBarView::WriteDragDataForView(views::View* sender,
   DCHECK_NE(GetDragOperationsForView(sender, press_pt),
             ui::DragDropTypes::DRAG_NONE);
 
-  TabContents* tab_contents = delegate_->GetTabContents();
+  TabContents* tab_contents = GetTabContents();
   DCHECK(tab_contents);
   button_drag_utils::SetURLAndDragImage(
       tab_contents->web_contents()->GetURL(),