Make tabOverlap dynamic depending on the number of non-mini tabs presented on...

chrome/browser/cocoa/tab_controller.mm

Index: chrome/browser/cocoa/tab_controller.mm
===================================================================
--- chrome/browser/cocoa/tab_controller.mm	(revision 57038)
+++ chrome/browser/cocoa/tab_controller.mm	(working copy)
@@ -144,6 +144,11 @@
   }
 }
 
+- (BOOL)hovered {
+  TabView* tabView = static_cast<TabView*>([self view]);
+  return [tabView isMouseIn];
+}
+
 - (void)setTitle:(NSString*)title {
   [[self view] setToolTip:title];
   if ([self mini] && ![self selected]) {
@@ -222,7 +227,7 @@
 // Returns YES if we should be showing the close button. The selected tab
 // always shows the close button.
 - (BOOL)shouldShowCloseButton {
-  if ([self mini])
+  if ([self mini] || (![self selected] && [self hovered]))
     return NO;
   return ([self selected] || [self iconCapacity] >= 3);
 }