Removed XCallbackParameters and related code.

ios/chrome/browser/xcallback_parameters.h

Index: ios/chrome/browser/xcallback_parameters.h
diff --git a/ios/chrome/browser/xcallback_parameters.h b/ios/chrome/browser/xcallback_parameters.h
deleted file mode 100644
index 8d5cdda9209e6469afee772bf8f342bdfbeb8f9a..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/xcallback_parameters.h
+++ /dev/null
@@ -1,26 +0,0 @@
-// Copyright 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef IOS_CHROME_BROWSER_XCALLBACK_PARAMETERS_H_
-#define IOS_CHROME_BROWSER_XCALLBACK_PARAMETERS_H_
-
-#import <Foundation/Foundation.h>
-
-// This class contains the defining parameters for an XCallback request from
-// another app.
-@interface XCallbackParameters : NSObject<NSCoding, NSCopying>
-
-// The id of the calling app.
-@property(nonatomic, readonly, copy) NSString* sourceAppId;
-
-// Designated initializer. |sourceAppId| is the string identifier for the app
-// that launched Chrome and cannot be nil.
-- (instancetype)initWithSourceAppId:(NSString*)sourceAppId
-    NS_DESIGNATED_INITIALIZER;
-
-- (instancetype)init NS_UNAVAILABLE;
-
-@end
-
-#endif  // IOS_CHROME_BROWSER_XCALLBACK_PARAMETERS_H_