Remove the app banner navigation heuristic.

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 963e1610c48834590d70117914c5efb678b5d553..a54350958cabb6e46bc30805f6590bd852587f33 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -429,12 +429,6 @@ const char kEnableSaveAsMenuLabelExperiment[] = "saveas-menu-label";
 // (see SettingsWindowEnabled() below).
 const char kEnableSettingsWindow[]           = "enable-settings-window";
 
-// Enable the Site Engagement App Banner which triggers app install banners
-// using the site engagement service rather than a navigation-based heuristic.
-// Implicitly enables the site engagement service.
-const char kEnableSiteEngagementAppBanner[] =
-    "enable-site-engagement-app-banner";
-
 // Enable the Site Engagement Eviction Policy which evicts temporary storage
 // using the site engagement service. Implicitly enables the site engagement
 // service.