[MDC roll] Roll Material Components to 846ba52581878f3c176ebf2e0a78b51b8b0feaeb

Removed src/components/ButtonBar/src/private/MDCButtonBarButton+Private.h

Bug: 833726
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I141ee872a3255039f35a5bb9bf0aecd77277b435
Reviewed-on: https://chromium-review.googlesource.com/1014499Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551328}

DEPS

@@ -256,7 +256,7 @@ deps = {
   },
 
   'src/ios/third_party/material_components_ios/src': {
-      'url': Var('chromium_git') + '/external/github.com/material-components/material-components-ios.git' + '@' + 'f31cb3b806c925e898266f5350fd2ab6f7217dd8',
+      'url': Var('chromium_git') + '/external/github.com/material-components/material-components-ios.git' + '@' + '846ba52581878f3c176ebf2e0a78b51b8b0feaeb',
       'condition': 'checkout_ios',
   },
 

ios/third_party/material_components_ios/BUILD.gn

@@ -94,7 +94,6 @@ source_set("material_components_ios") {
     "src/components/ButtonBar/src/MaterialButtonBar.h",
     "src/components/ButtonBar/src/private/MDCAppBarButtonBarBuilder.h",
     "src/components/ButtonBar/src/private/MDCAppBarButtonBarBuilder.m",
-    "src/components/ButtonBar/src/private/MDCButtonBarButton+Private.h",
     "src/components/ButtonBar/src/private/MDCButtonBarButton.m",
     "src/components/Buttons/src/MDCButton.h",
     "src/components/Buttons/src/MDCButton.m",