Remove SignInSource from ShowSigninCommand.

ios/chrome/browser/ui/commands/show_signin_command.mm

 // Copyright 2014 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.
 
 #import "ios/chrome/browser/ui/commands/show_signin_command.h"
 
 #include "base/logging.h"
 #include "base/mac/scoped_block.h"
 #include "ios/chrome/browser/ui/commands/ios_command_ids.h"
 
 @implementation ShowSigninCommand {
   base::mac::ScopedBlock<ShowSigninCommandCompletionCallback> _callback;
 }
 
 @synthesize operation = _operation;
-@synthesize signInSource = _signInSource;
 @synthesize signInAccessPoint = _signInAccessPoint;
 
 - (instancetype)initWithTag:(NSInteger)tag {
   NOTREACHED();
   return nil;
 }
 
 - (instancetype)initWithOperation:(AuthenticationOperation)operation
-                     signInSource:(SignInSource)signInSource
-                         callback:
-                             (ShowSigninCommandCompletionCallback)callback {
-  if ((self = [super initWithTag:IDC_SHOW_SIGNIN_IOS])) {
-    _operation = operation;
-    _signInSource = signInSource;
-    _callback.reset(callback, base::scoped_policy::RETAIN);
-  }
-  return self;
-}
-
-- (instancetype)initWithOperation:(AuthenticationOperation)operation
-                     signInSource:(SignInSource)signInSource {
-  return
-      [self initWithOperation:operation signInSource:signInSource callback:nil];
-}
-
-- (instancetype)initWithOperation:(AuthenticationOperation)operation
                 signInAccessPoint:(signin_metrics::AccessPoint)signInAccessPoint
                          callback:
                              (ShowSigninCommandCompletionCallback)callback {
-  if ((self = [self initWithOperation:operation
-                         signInSource:SIGN_IN_SOURCE_OTHER
-                             callback:callback])) {
+  if ((self = [super initWithTag:IDC_SHOW_SIGNIN_IOS])) {
+    _operation = operation;
     _signInAccessPoint = signInAccessPoint;
+    _callback.reset(callback, base::scoped_policy::RETAIN);
   }
   return self;
 }
 
 - (instancetype)initWithOperation:(AuthenticationOperation)operation
                 signInAccessPoint:
                     (signin_metrics::AccessPoint)signInAccessPoint {
   return [self initWithOperation:operation
                signInAccessPoint:signInAccessPoint
                         callback:nil];
 }
 
 - (ShowSigninCommandCompletionCallback)callback {
   return _callback.get();
 }
 
 @end