Whitelist voice_icon_keyboard_accessory as not found image

ios/chrome/app/startup/setup_debugging.mm

 // Copyright 2016 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.
 
 #include "ios/chrome/app/startup/setup_debugging.h"
 
 #include <objc/runtime.h>
 
 #include "base/logging.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 13 matching lines @@
   // Retained by the swizzle block.
   NSMutableSet* whiteList = [NSMutableSet set];
 
   // TODO(crbug.com/720337): Add missing image.
   [whiteList addObject:@"card_close_button_pressed_incognito"];
   // TODO(crbug.com/720355): Add missing image.
   [whiteList addObject:@"find_close_pressed_incognito"];
   // TODO(crbug.com/720338): Add missing images.
   [whiteList addObject:@"glif-mic-to-dots-large_37"];
   [whiteList addObject:@"glif-google-to-dots_28"];
+  // TODO(crbug.com/721338): Add missing image.
+  [whiteList addObject:@"voice_icon_keyboard_accessory"];
 
   // The original implementation of [UIImage imageNamed:].
   // Called by the new implementation.
   static IMP originalImp;
   IMP* originalImpPtr = &originalImp;
 
   id swizzleBlock = ^(id self, NSString* imageName) {
     // Call the original [UIImage imageNamed:] method.
     IMP imp = *originalImpPtr;
     Class aClass = objc_getClass("UIImage");
@@ skipping 25 matching lines @@
   DCHECK(ObjcEvilDoers::ZombieEnable(true, 10000));
 #endif
 
 // Enable the detection of missing image assets.
 #ifndef NDEBUG
   swizzleUIImageImageNamed();
 #endif
 }
 
 @end