views: remove arrow from extension install dialog's details section

chrome/browser/ui/views/extensions/extension_install_dialog_view.h

Index: chrome/browser/ui/views/extensions/extension_install_dialog_view.h
diff --git a/chrome/browser/ui/views/extensions/extension_install_dialog_view.h b/chrome/browser/ui/views/extensions/extension_install_dialog_view.h
index 0c52a3ee125c15c78eec814004b79507281dbc14..e8edbfb118c01646b8579a6abb766afbd63ddaf6 100644
--- a/chrome/browser/ui/views/extensions/extension_install_dialog_view.h
+++ b/chrome/browser/ui/views/extensions/extension_install_dialog_view.h
@@ -31,7 +31,6 @@ class ResourceBundle;
 
 namespace views {
 class GridLayout;
-class ImageButton;
 class Link;
 }
 
@@ -170,6 +169,7 @@ class ExpandableContainerView : public views::View,
 
     // views::View:
     gfx::Size GetPreferredSize() const override;
+    int GetHeightForWidth(int width) const override;
 
     void AddDetail(const base::string16& detail);
 
@@ -186,9 +186,6 @@ class ExpandableContainerView : public views::View,
   // Expand/Collapse the detail section for this ExpandableContainerView.
   void ToggleDetailLevel();
 
-  // Updates |arrow_toggle_| according to the given state.
-  void UpdateArrowToggle(bool expanded);
-
   // A view for showing |issue_advice.details|.
   DetailsView* details_view_;
 
@@ -198,10 +195,6 @@ class ExpandableContainerView : public views::View,
   // when the details section is expanded).
   views::Link* more_details_;
 
-  // The up/down arrow next to the 'more detail' link (points up/down depending
-  // on whether the details section is expanded).
-  views::ImageButton* arrow_toggle_;
-
   // Whether the details section is expanded.
   bool expanded_;