[iOS] Load chrome_300_percent.pak file on @3x devices.

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 <QuartzCore/QuartzCore.h>
 #import <UIKit/UIKit.h>
 
 #include "base/basictypes.h"
@@ skipping 36 matching lines @@
   if (IsScaleFactorSupported(SCALE_FACTOR_100P)) {
     AddDataPackFromPath(GetResourcesPakFilePath(@"chrome_100_percent", nil),
                         SCALE_FACTOR_100P);
   }
 
   if (IsScaleFactorSupported(SCALE_FACTOR_200P)) {
     AddDataPackFromPath(GetResourcesPakFilePath(@"chrome_200_percent", nil),
                         SCALE_FACTOR_200P);
   }
 
-  // TODO(rohitrao): Add a chrome_300_percent file and load it here.  For now,
-  // we are simply falling back to the 200P resources. http://crbug.com/413300.
   if (IsScaleFactorSupported(SCALE_FACTOR_300P)) {
-    AddDataPackFromPath(GetResourcesPakFilePath(@"chrome_200_percent", nil),
-                        SCALE_FACTOR_200P);
+    AddDataPackFromPath(GetResourcesPakFilePath(@"chrome_300_percent", nil),
+                        SCALE_FACTOR_300P);
   }
 }
 
 base::FilePath ResourceBundle::GetLocaleFilePath(const std::string& app_locale,
                                                  bool test_file_exists) {
   NSString* mac_locale = base::SysUTF8ToNSString(app_locale);
 
   // iOS uses "_" instead of "-", so swap to get a iOS-style value.
   mac_locale = [mac_locale stringByReplacingOccurrencesOfString:@"-"
                                                      withString:@"_"];
@@ skipping 114 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