FontAccess: Remove DISALLOW_COPY_AND_ASSIGN for FontManager

Removes the use of DISALLOW_COPY_AND_ASSIGN for FontManager because
this macro is deprecated.

Change-Id: Ibd14c06b712cef75885a521003d18d668f256312
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2488985
Commit-Queue: Joshua Bell <jsbell@chromium.org>
Auto-Submit: Olivier Yiptong <oyiptong@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819474}

third_party/blink/renderer/modules/font_access/font_manager.h

@@ -20,9 +20,13 @@ class FontManager final : public ScriptWrappable {
 
  public:
   FontManager() = default;
+
+  // Disallow copy and assign.
+  FontManager(const FontManager&) = delete;
+  FontManager operator=(const FontManager&) = delete;
+
   ScriptValue query(ScriptState*, ExceptionState&);
 
-  DISALLOW_COPY_AND_ASSIGN(FontManager);
   void Trace(blink::Visitor*) const override;
 };