Add VectorIconButton functionality to ImageButton.

chrome/browser/ui/views/tabs/tab_strip.cc

Index: chrome/browser/ui/views/tabs/tab_strip.cc
diff --git a/chrome/browser/ui/views/tabs/tab_strip.cc b/chrome/browser/ui/views/tabs/tab_strip.cc
index e22c45709fd4e6b4064187737033379e62305ec0..e36b6141be81bba4dc81f27488c8e5a5755f72a6 100644
--- a/chrome/browser/ui/views/tabs/tab_strip.cc
+++ b/chrome/browser/ui/views/tabs/tab_strip.cc
@@ -269,7 +269,7 @@ const TabSizeInfo& GetTabSizeInfo() {
 class NewTabButton : public views::ImageButton,
                      public views::MaskedTargeterDelegate {
  public:
-  NewTabButton(TabStrip* tab_strip, views::ButtonListener* listener);
+  NewTabButton(TabStrip* tab_strip, views::ImageButtonDelegate* listener);
   ~NewTabButton() override;
 
   // Set the background offset used to match the background image to the frame
@@ -318,10 +318,9 @@ class NewTabButton : public views::ImageButton,
   DISALLOW_COPY_AND_ASSIGN(NewTabButton);
 };
 
-NewTabButton::NewTabButton(TabStrip* tab_strip, views::ButtonListener* listener)
-    : views::ImageButton(listener),
-      tab_strip_(tab_strip),
-      destroyed_(NULL) {
+NewTabButton::NewTabButton(TabStrip* tab_strip,
+                           views::ImageButtonDelegate* listener)
+    : views::ImageButton(listener), tab_strip_(tab_strip), destroyed_(NULL) {
   set_animate_on_state_change(true);
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
   set_triggerable_event_flags(triggerable_event_flags() |