Remove the experimental prominent add to app launcher flow.

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 47c03b11717b3de7d7f40d56b55f38e3ff70665c..5159a2fce2bddaad7539a243438544bc2b6c320f 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -530,9 +530,6 @@ const char kEnablePrivetStorage[]           = "enable-privet-storage";
 // during chrome_browser_main.
 const char kEnableProfiling[]               = "enable-profiling";
 
-// Enables showing a prominent UI for initiating the URL app creation flow.
-const char kEnableProminentURLAppFlow[]     = "enable-prominent-url-app-flow";
-
 // Enables query in the omnibox.
 const char kEnableQueryExtraction[]         = "enable-query-extraction";