P2.1a.

chrome/browser/cocoa/tab_strip_controller.h

Index: chrome/browser/cocoa/tab_strip_controller.h
diff --git a/chrome/browser/cocoa/tab_strip_controller.h b/chrome/browser/cocoa/tab_strip_controller.h
index b52f6c4289bc34e70185f45530bdbeafaf848f0e..32500a1cf520b9d6a5199ed7ac6302f29f340151 100644
--- a/chrome/browser/cocoa/tab_strip_controller.h
+++ b/chrome/browser/cocoa/tab_strip_controller.h
@@ -87,6 +87,11 @@ class ToolbarModel;
   // once to prevent them from resizing to fit the full width. If the entire
   // width should be used, this will have a value of |kUseFullAvailableWidth|.
   float availableResizeWidth_;
+
+  // Width the last tab should get in layout. Only non-null when
+  // |availableResizeWidth_| is not equal to |kUseFullAvailableWidth|.
+  scoped_ptr<CGFloat> lastClosedTabWidth_;
+
   // A tracking area that's the size of the tab strip used to be notified
   // when the mouse moves in the tab strip
   scoped_nsobject<NSTrackingArea> trackingArea_;