--- a/gpu/ipc/common/mailbox_struct_traits.h
+++ b/gpu/ipc/common/mailbox_struct_traits.h
@@ -15,7 +15,7 @@ namespace mojo {
 template <>
 struct StructTraits<gpu::mojom::MailboxDataView, gpu::Mailbox> {
   static base::span<const int8_t> name(const gpu::Mailbox& mailbox) {
-    return mailbox.name;
+    return base::make_span(mailbox.name);
   }
   static bool Read(gpu::mojom::MailboxDataView data, gpu::Mailbox* out);
 };
--- a/services/viz/public/cpp/compositing/filter_operation_struct_traits.h
+++ b/services/viz/public/cpp/compositing/filter_operation_struct_traits.h
@@ -134,7 +134,7 @@ struct StructTraits<viz::mojom::FilterOperationDataView, cc::FilterOperation> {
   static base::span<const float> matrix(const cc::FilterOperation& operation) {
     if (operation.type() != cc::FilterOperation::COLOR_MATRIX)
       return base::span<const float>();
-    return operation.matrix();
+    return base::make_span(operation.matrix());
   }
 
   static base::span<const gfx::Rect> shape(
--- a/services/viz/public/cpp/compositing/quads_struct_traits.h
+++ b/services/viz/public/cpp/compositing/quads_struct_traits.h
@@ -284,7 +284,7 @@
 
   static base::span<const float> vertex_opacity(const cc::DrawQuad& input) {
     const cc::TextureDrawQuad* quad = cc::TextureDrawQuad::MaterialCast(&input);
-    return quad->vertex_opacity;
+    return base::make_span(quad->vertex_opacity);
   }
 
   static bool y_flipped(const cc::DrawQuad& input) {
--- a/third_party/WebKit/Source/platform/exported/WebCORS.cpp
+++ b/third_party/WebKit/Source/platform/exported/WebCORS.cpp
@@ -480,7 +480,7 @@ WebString AccessControlErrorString(
     }
     default:
       NOTREACHED();
-      return "";
+      return WebString();
   }
 }
 
@@ -512,7 +512,7 @@ WebString PreflightErrorString(const PreflightStatus status,
     }
     default:
       NOTREACHED();
-      return "";
+      return WebString();
   }
 }
 
@@ -533,7 +533,7 @@ WebString RedirectErrorString(const RedirectStatus status,
     }
     default:
       NOTREACHED();
-      return "";
+      return WebString();
   }
 }