Use MDCTypography instead of MDFRobotoFontLoader directly.

ios/chrome/browser/ui/util/text_region_mapper_unittest.mm

 // Copyright 2015 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 <UIKit/UIKit.h>
 
 #include "base/mac/foundation_util.h"
 #include "ios/chrome/browser/ui/util/text_region_mapper.h"
-#import "ios/third_party/material_roboto_font_loader_ios/src/src/MaterialRobotoFontLoader.h"
+#import "ios/third_party/material_components_ios/src/components/Typography/src/MaterialTypography.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace {
 class TextRegionMapperTest : public PlatformTest {
@@ skipping 92 matching lines @@
 
 TEST_F(TextRegionMapperTest, CJKTest) {
   CGRect bounds = CGRectMake(0, 0, 345, 65);
   // clang-format off
   NSString* CJKString =
       @"“触摸搜索”会将所选字词和当前页面（作为上下文）一起发送给 Google 搜索。"
       @"您可以在设置中停用此功能。";
   // clang-format on
   NSMutableDictionary* attributes = [NSMutableDictionary
       dictionaryWithDictionary:AttributesForTextAlignment(NSTextAlignmentLeft)];
-  attributes[NSFontAttributeName] =
-      [[MDFRobotoFontLoader sharedInstance] regularFontOfSize:16];
+  attributes[NSFontAttributeName] = [MDCTypography subheadFont];
   NSAttributedString* string =
       [[NSAttributedString alloc] initWithString:CJKString
                                       attributes:attributes];
   InitMapper(string, bounds);
 
   NSRange range = NSMakeRange(0, 6);  // "“触摸搜索”".
   NSArray* rects = [_textMapper rectsForRange:range];
   ASSERT_EQ(1UL, [rects count]);
 }
 
 /*
  Further unit tests should cover additional cases:
  - In several languages.
  - Range split across line break == two rects
  - Bidi text with text range across scripts gets two rects.
  - Various string attributions.
  - Isolate buggy CoreText case.
 */