Removed XCallbackParameters and related code.

ios/chrome/app/chrome_app_startup_parameters.mm

Index: ios/chrome/app/chrome_app_startup_parameters.mm
diff --git a/ios/chrome/app/chrome_app_startup_parameters.mm b/ios/chrome/app/chrome_app_startup_parameters.mm
index aeafd78661e77ff528a2ac727d25163825254829..5e3153becb74d593d8d48ed61c7b00b4ef5782f3 100644
--- a/ios/chrome/app/chrome_app_startup_parameters.mm
+++ b/ios/chrome/app/chrome_app_startup_parameters.mm
@@ -10,7 +10,6 @@
 #include "base/metrics/user_metrics_action.h"
 #include "base/strings/sys_string_conversions.h"
 #include "ios/chrome/browser/chrome_url_constants.h"
-#include "ios/chrome/browser/xcallback_parameters.h"
 #include "ios/chrome/common/app_group/app_group_constants.h"
 #include "ios/chrome/common/x_callback_url.h"
 #import "net/base/mac/url_conversions.h"
@@ -56,18 +55,10 @@ enum MobileSessionStartAction {
 }
 
 - (instancetype)initWithExternalURL:(const GURL&)externalURL
-                xCallbackParameters:(XCallbackParameters*)xCallbackParameters {
-  NOTREACHED();
-  return nil;
-}
-
-- (instancetype)initWithExternalURL:(const GURL&)externalURL
-                xCallbackParameters:(XCallbackParameters*)xCallbackParameters
                   declaredSourceApp:(NSString*)declaredSourceApp
                     secureSourceApp:(NSString*)secureSourceApp
                         completeURL:(NSURL*)completeURL {
-  self = [super initWithExternalURL:externalURL
-                xCallbackParameters:xCallbackParameters];
+  self = [super initWithExternalURL:externalURL];
   if (self) {
     _declaredSourceApp = [declaredSourceApp copy];
     _secureSourceApp = [secureSourceApp copy];
@@ -120,12 +111,8 @@ enum MobileSessionStartAction {
       return nil;
     }
 
-    XCallbackParameters* xcallbackParameters =
-        [[XCallbackParameters alloc] initWithSourceAppId:appId];
-
     return [[ChromeAppStartupParameters alloc]
         initWithExternalURL:url
-        xCallbackParameters:xcallbackParameters
           declaredSourceApp:appId
             secureSourceApp:nil
                 completeURL:completeURL];
@@ -145,7 +132,6 @@ enum MobileSessionStartAction {
     if (!externalURL.is_valid())
       return nil;
     return [[ChromeAppStartupParameters alloc] initWithExternalURL:externalURL
-                                               xCallbackParameters:nil
                                                  declaredSourceApp:appId
                                                    secureSourceApp:nil
                                                        completeURL:completeURL];
@@ -166,7 +152,6 @@ enum MobileSessionStartAction {
     if (!externalURL.is_valid())
       return nil;
     return [[ChromeAppStartupParameters alloc] initWithExternalURL:externalURL
-                                               xCallbackParameters:nil
                                                  declaredSourceApp:appId
                                                    secureSourceApp:nil
                                                        completeURL:completeURL];
@@ -243,7 +228,6 @@ enum MobileSessionStartAction {
                               app_group::kChromeAppGroupVoiceSearchCommand)]) {
     ChromeAppStartupParameters* params = [[ChromeAppStartupParameters alloc]
         initWithExternalURL:GURL(kChromeUINewTabURL)
-        xCallbackParameters:nil
           declaredSourceApp:appId
             secureSourceApp:secureSourceApp
                 completeURL:url];
@@ -255,7 +239,6 @@ enum MobileSessionStartAction {
                                    app_group::kChromeAppGroupNewTabCommand)]) {
     return [[ChromeAppStartupParameters alloc]
         initWithExternalURL:GURL(kChromeUINewTabURL)
-        xCallbackParameters:nil
           declaredSourceApp:appId
             secureSourceApp:secureSourceApp
                 completeURL:url];
@@ -266,7 +249,6 @@ enum MobileSessionStartAction {
                               app_group::kChromeAppGroupFocusOmniboxCommand)]) {
     ChromeAppStartupParameters* params = [[ChromeAppStartupParameters alloc]
         initWithExternalURL:GURL(kChromeUINewTabURL)
-        xCallbackParameters:nil
           declaredSourceApp:appId
             secureSourceApp:secureSourceApp
                 completeURL:url];
@@ -283,7 +265,6 @@ enum MobileSessionStartAction {
       return nil;
     return
         [[ChromeAppStartupParameters alloc] initWithExternalURL:externalURL
-                                            xCallbackParameters:nil
                                               declaredSourceApp:appId
                                                 secureSourceApp:secureSourceApp
                                                     completeURL:url];
@@ -294,7 +275,6 @@ enum MobileSessionStartAction {
                               app_group::kChromeAppGroupQRScannerCommand)]) {
     ChromeAppStartupParameters* params = [[ChromeAppStartupParameters alloc]
         initWithExternalURL:GURL(kChromeUINewTabURL)
-        xCallbackParameters:nil
           declaredSourceApp:appId
             secureSourceApp:secureSourceApp
                 completeURL:url];
@@ -307,7 +287,6 @@ enum MobileSessionStartAction {
                        app_group::kChromeAppGroupIncognitoSearchCommand)]) {
     ChromeAppStartupParameters* params = [[ChromeAppStartupParameters alloc]
         initWithExternalURL:GURL(kChromeUINewTabURL)
-        xCallbackParameters:nil
           declaredSourceApp:appId
             secureSourceApp:secureSourceApp
                 completeURL:url];