Update to Chromium version 74.0.3729.0 (#638880)

- Windows: 10.0.17763.0 SDK is now required.
- Mac: 10.13 SDK is now required.
- Removed CefRequestContext::ResolveHostCached which is no longer supported by Chromium.

libcef/browser/osr/osr_accessibility_util.cc

@@ -191,6 +191,9 @@ struct PopulateAxNodeAttributes {
         }
         attributes->SetList(ToString(attr.first), list);
       } break;
+      case ax::mojom::IntAttribute::kImageAnnotationStatus: {
+        // TODO(cef): Implement support for Image Annotation Status
+      } break;
     }
   }