[Squad] Remove mutable style access in TextAutosizer.

Bug: 813068
Change-Id: If8b7489c69b85237d422c6b3d030fdd79ca7017a
Reviewed-on: https://chromium-review.googlesource.com/983955Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547667}

third_party/WebKit/Source/core/layout/TextAutosizer.cpp

@@ -1111,7 +1111,7 @@ void TextAutosizer::ApplyMultiplier(LayoutObject* layout_object,
                                     SubtreeLayoutScope* layouter,
                                     RelayoutBehavior relayout_behavior) {
   DCHECK(layout_object);
-  ComputedStyle& current_style = layout_object->MutableStyleRef();
+  const ComputedStyle& current_style = layout_object->StyleRef();
   if (!current_style.GetTextSizeAdjust().IsAuto()) {
     // The accessibility font scale factor is applied by the autosizer so we
     // need to apply that scale factor on top of the text-size-adjust

third_party/WebKit/Source/core/layout/TextAutosizer.h

@@ -351,7 +351,7 @@ class CORE_EXPORT TextAutosizer final
   // Clusters are created and destroyed during layout
   ClusterStack cluster_stack_;
   FingerprintMapper fingerprint_mapper_;
-  Vector<scoped_refptr<ComputedStyle>> styles_retained_during_layout_;
+  Vector<scoped_refptr<const ComputedStyle>> styles_retained_during_layout_;
   // FIXME: All frames should share the same m_pageInfo instance.
   PageInfo page_info_;
   bool update_page_info_deferred_;