diff --git a/shared_image_backing.h b/shared_image_backing.h.new
index 97ebd0b..fc6179c 100644
--- a/gpu/command_buffer/service/shared_image/shared_image_backing.h
+++ b/gpu/command_buffer/service/shared_image/shared_image_backing.h
@@ -338,7 +338,7 @@ class GPU_GLES2_EXPORT SharedImageBacking {
  private:
   class ScopedWriteUMA {
    public:
-    ScopedWriteUMA() = default;
+    ScopedWriteUMA() : content_consumed_(false) {}
 
     ScopedWriteUMA(const ScopedWriteUMA&) = delete;
     ScopedWriteUMA& operator=(const ScopedWriteUMA&) = delete;
@@ -352,7 +352,7 @@ class GPU_GLES2_EXPORT SharedImageBacking {
     void SetConsumed() { content_consumed_ = true; }
 
    private:
-    bool content_consumed_ = false;
+    bool content_consumed_;
   };
 
   const Mailbox mailbox_;
diff --git a/history_item.h b/history_item.h.new
index 15fea48..ba59305 100644
--- a/third_party/blink/renderer/core/loader/history_item.h
+++ b/third_party/blink/renderer/core/loader/history_item.h
@@ -77,13 +77,13 @@ class CORE_EXPORT HistoryItem final : public GarbageCollected<HistoryItem> {
     DISALLOW_NEW();
 
    public:
-    ViewState() = default;
+    ViewState() : page_scale_factor_(0) {}
     ViewState(const ViewState&) = default;
     ViewState& operator=(const ViewState&) = default;
 
     ScrollOffset visual_viewport_scroll_offset_;
     ScrollOffset scroll_offset_;
-    float page_scale_factor_ = 0;
+    float page_scale_factor_;
     ScrollAnchorData scroll_anchor_data_;
   };