[rAC, OSX] Force better initial size for sign-in (2nd try)

chrome/browser/ui/cocoa/autofill/autofill_dialog_window_controller.mm

 // Copyright 2013 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 "chrome/browser/ui/cocoa/autofill/autofill_dialog_window_controller.h"
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #include "chrome/browser/ui/autofill/autofill_dialog_view_delegate.h"
@@ skipping 378 matching lines @@
   [[mainContainer_ sectionForId:section] fillForInput:input];
   [mainContainer_ updateSaveInChrome];
 }
 
 - (void)updateForErrors {
   [mainContainer_ validate];
 }
 
 - (content::NavigationController*)showSignIn {
   [self updateSignInSizeConstraints];
+  // Ensure |signInContainer_| is set to the same size as |mainContainer_|, to
+  // force its minimum size so that there will not be a resize until the
+  // contents are loaded.
+  [[signInContainer_ view] setFrameSize:[[mainContainer_ view] frame].size];
   [signInContainer_ loadSignInPage];
+
   [[signInContainer_ view] setHidden:NO];
   [self updateMainContainerVisibility];
   [self requestRelayout];
 
   return [signInContainer_ navigationController];
 }
 
 - (void)getInputs:(autofill::FieldValueMap*)output
        forSection:(autofill::DialogSection)section {
   [[mainContainer_ sectionForId:section] getInputs:output];
@@ skipping 60 matching lines @@
 
 - (content::WebContents*)getSignInWebContents {
   return [signInContainer_ webContents];
 }
 
 - (BOOL)isShowingOverlay {
   return ![[overlayController_ view] isHidden];
 }
 
 @end