Remove command line flag to install an ephemeral app.

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 a18553e675126281e253c1584f94deba0a3c41ab..00be88bbb7c8d63cfb605a761f65deadf262aae7 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -667,12 +667,6 @@ const char kIncognito[]                     = "incognito";
 // Causes Chrome to initiate an installation flow for the given app.
 const char kInstallChromeApp[]              = "install-chrome-app";
 
-// Causes Chrome to attempt to get metadata from the webstore for the
-// app/extension ID given, and then prompt the user to download and install it.
-// This is allowed *only* for ephemeral apps. All other ids will be ignored.
-const char kInstallEphemeralAppFromWebstore[] =
-    "install-ephemeral-app-from-webstore";
-
 // A list of whitelists to install for a supervised user, for testing.
 // The list is of the following form: <id>[:<name>],[<id>[:<name>],...]
 const char kInstallSupervisedUserWhitelists[] =