Always add 100P scale format in the supported format list.

ui/base/resource/resource_bundle_ios.mm

 // 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.
 
 #include "ui/base/resource/resource_bundle.h"
 
 #import <UIKit/UIKit.h>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
@@ skipping 89 matching lines @@
   }
 
   gfx::Image image;
   if (delegate_)
     image = delegate_->GetNativeImageNamed(resource_id, rtl);
 
   if (image.IsEmpty()) {
     // Load the raw data from the resource pack at the current supported scale
     // factor.  This code assumes that only one of the possible scale factors is
     // supported at runtime, based on the device resolution.
-    std::vector<ui::ScaleFactor> supported_scale_factors =
-              ui::GetSupportedScaleFactors();
-    DCHECK_EQ(1U, supported_scale_factors.size());
-    ui::ScaleFactor scale_factor = supported_scale_factors[0];
+    ui::ScaleFactor scale_factor = ui::GetMaxScaleFactor();
 
     scoped_refptr<base::RefCountedStaticMemory> data(
         LoadDataResourceBytesForScale(resource_id, scale_factor));
 
     // Create a data object from the raw bytes.
     scoped_nsobject<NSData> ns_data(
         [[NSData alloc] initWithBytes:data->front() length:data->size()]);
 
     // Create the image from the data. The gfx::Image will take ownership.
     scoped_nsobject<UIImage> ui_image(
@@ skipping 13 matching lines @@
 
   // Another thread raced the load and has already cached the image.
   if (images_.count(resource_id))
     return images_[resource_id];
 
   images_[resource_id] = image;
   return images_[resource_id];
 }
 
 }  // namespace ui