Use MDCTypography instead of MDFRobotoFontLoader directly.

ios/chrome/browser/ui/ntp/recent_tabs/views/panel_bar_view.mm

 // Copyright 2014 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/browser/ui/ntp/recent_tabs/views/panel_bar_view.h"
 
 #import "ios/chrome/browser/ui/ntp/recent_tabs/views/views_utils.h"
 #include "ios/chrome/browser/ui/rtl_geometry.h"
 #include "ios/chrome/browser/ui/ui_util.h"
 #import "ios/chrome/browser/ui/uikit_ui_util.h"
 #include "ios/chrome/grit/ios_strings.h"
 #import "ios/third_party/material_components_ios/src/components/Typography/src/MaterialTypography.h"
-#import "ios/third_party/material_roboto_font_loader_ios/src/src/MaterialRobotoFontLoader.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace {
 
 const int kBackgroundColor = 0xf2f2f2;
-const CGFloat kFontSize = 20;
 
 }  // namespace
 
 @interface PanelBarView () {
   UIButton* _closeButton;
   NSLayoutConstraint* _statusBarSpacerConstraint;
 }
 // Whether the panel view extends throughout the whole screen. For example,
 // when presented fullscreen, the panel bar extends to the borders of the app
 // and the function returns YES.
 // When presented modally as on iPad and iPhone 6 Plus landscape, it returns NO.
 - (BOOL)coversFullAppWidth;
 @end
 
 @implementation PanelBarView
 
 - (instancetype)init {
   self = [super initWithFrame:CGRectZero];
   if (self) {
     [self setBackgroundColor:UIColorFromRGB(kBackgroundColor)];
     // Create and add the bar's title.
     UILabel* title = [[UILabel alloc] initWithFrame:CGRectZero];
     [title setTranslatesAutoresizingMaskIntoConstraints:NO];
-    [title setFont:[[MDFRobotoFontLoader sharedInstance]
-                       mediumFontOfSize:kFontSize]];
+    [title setFont:[MDCTypography titleFont]];
     [title setTextColor:recent_tabs::GetTextColorGray()];
     [title setTextAlignment:NSTextAlignmentNatural];
     [title setText:l10n_util::GetNSString(IDS_IOS_NEW_TAB_RECENT_TABS)];
     [title setBackgroundColor:UIColorFromRGB(kBackgroundColor)];
     [self addSubview:title];
 
     // Create and add the bar's close button.
     _closeButton = [[UIButton alloc] initWithFrame:CGRectZero];
     [_closeButton setTranslatesAutoresizingMaskIntoConstraints:NO];
     [_closeButton
@@ skipping 64 matching lines @@
   [self setNeedsUpdateConstraints];
   [super layoutSubviews];
 }
 
 - (BOOL)coversFullAppWidth {
   return self.traitCollection.horizontalSizeClass ==
          self.window.traitCollection.horizontalSizeClass;
 }
 
 @end