Remove the flag --disable-hide-inactive-stacked-tab-close-buttons

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index d807e2bf5e258c0a37f5ab561906b87fe7449711..a7aef8bab7573292183681d013173463d73de006 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -176,11 +176,6 @@ const char kDisableGpuSandbox[]             = "disable-gpu-sandbox";
 // Manager can be used to terminate the offending process in this case.
 const char kDisableHangMonitor[]            = "disable-hang-monitor";
 
-// Disable hiding the close buttons of inactive tabs when the tabstrip is in
-// stacked mode.
-const char kDisableHideInactiveStackedTabCloseButtons[] =
-    "disable-hide-inactive-stacked-tab-close-buttons";
-
 // Disable the RenderThread's HistogramCustomizer.
 const char kDisableHistogramCustomizer[]    = "disable-histogram-customizer";