Handful of related instant changes:

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index da136d1930c00dbc9170cad2ea157177398466f1..f65f86a94ef3b552e3b46b8ccd70047474ba335b 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -1004,9 +1004,6 @@ const char kServiceAccountLsid[]            = "service-account-lsid";
 // See kHideIcons.
 const char kShowIcons[]                     = "show-icons";
 
-// If true the instant opt-in promo is shown in the omnibox.
-const char kShowInstantOptIn[]              = "show-instant-opt-in";
-
 // Renders a border around composited Render Layers to help debug and study
 // layer compositing.
 const char kShowCompositedLayerBorders[]    = "show-composited-layer-borders";