Fix task manager's default sizing.

ui/views/controls/scroll_view.cc

Index: ui/views/controls/scroll_view.cc
diff --git a/ui/views/controls/scroll_view.cc b/ui/views/controls/scroll_view.cc
index e9dbdac9fdd94cb6a246668d3329c8108b4b89e3..51e9ab72c3d3d76b615d35f3448d1b3c006233d7 100644
--- a/ui/views/controls/scroll_view.cc
+++ b/ui/views/controls/scroll_view.cc
@@ -272,14 +272,16 @@ void ScrollView::SetVerticalScrollBar(ScrollBar* vert_sb) {
 }
 
 gfx::Size ScrollView::GetPreferredSize() const {
-  if (!is_bounded())
-    return View::GetPreferredSize();
-
   gfx::Size size = contents()->GetPreferredSize();
   size.SetToMax(gfx::Size(size.width(), min_height_));
   size.SetToMin(gfx::Size(size.width(), max_height_));
   gfx::Insets insets = GetInsets();
   size.Enlarge(insets.width(), insets.height());
+
+  // If not vertically bounded, there's no specific preferred height.
+  if (!is_bounded())
+    size.set_height(0);
+
   return size;
 }