Remove the experimental prominent add to app launcher flow.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 9732bb17dc4a01b19728ed1d39916cbc58bedbba..bb90c7fbde9e00e4cce013a602992c86d27a1972 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -6393,12 +6393,6 @@ Keep your key file in a safe place. You will need it to create new versions of y
           If enabled, transitions during first-run tutorial are animated.
         </message>
       </if>
-      <message name="IDS_FLAGS_ENABLE_PROMINENT_URL_APP_FLOW_NAME" desc="Name of the flag to enable the prominent URL app creation flow.">
-        Enable the prominent URL app creation flow.
-      </message>
-      <message name="IDS_FLAGS_ENABLE_PROMINENT_URL_APP_FLOW_DESCRIPTION" desc="Description for the flag to enable the prominent URL app creation flow.">
-        Enables a more prominent way to create URL apps. Does nothing if Streamlined Hosted Apps is not enabled.
-      </message>
       <message name="IDS_FLAGS_ENABLE_STREAMLINED_HOSTED_APPS_NAME" desc="Name of the flag to enable streamlined hosted apps.">
         Enable experimental streamlined hosted apps.
       </message>
@@ -12983,7 +12977,7 @@ Some features may be unavailable.  Please check that the profile exists and you
     </message>
     <message name="IDS_DISALLOW_AUTOFILL_SYNC_CREDENTIAL_FOR_REAUTH" desc="The text for the choice to not allow autofilling for reauth pages in about:flags">
       Disallow for reauth
-    </message>    
+    </message>
 
     <!-- Update Recommended dialog -->
     <if expr="not chromeos">