[App banners] Add server-controlled experiment to disable app banners

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 97e9e10ac224c48b61ef5331305b0a4cca142c4f..58eb620a9206993bf6c9e30a1e8bd663e7c5a4c3 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -15074,14 +15074,6 @@ Do you accept?
          If enabled, EmbeddedSearch API will be used to submit search queries in the search results page.
         </message>
 
-        <!-- App install alerts strings -->
-        <message name="IDS_FLAGS_ENABLE_APP_INSTALL_ALERTS_NAME" desc="Title for the flag to allow app install alerts">
-          Enable app install alerts
-        </message>
-        <message name="IDS_FLAGS_ENABLE_APP_INSTALL_ALERTS_DESCRIPTION" desc="Description to allow app install alerts">
-          If enabled, websites will be parsed for app install alert meta tags.
-        </message>
-
         <!-- Flag strings for seccomp-bpf sandbox flag. -->
         <message name="IDS_FLAGS_ENABLE_SECCOMP_FILTER_SANDBOX_ANDROID_NAME" desc="Title for the flag to enable the seccomp-bpf sandbox on Android.">
           Enable seccomp-bpf renderer sandbox