fix: add OnUnconfirmedTapConvertedToTap override for gesture handling

Upstream added OnUnconfirmedTapConvertedToTap() as a pure virtual method
to RenderWidgetHostViewBase for resetting gesture timers when tap is
confirmed in TouchActionFilter.

Ref: https://chromium-review.googlesource.com/c/chromium/src/+/7141998

shell/browser/osr/osr_render_widget_host_view.h

@@ -131,6 +131,7 @@ class OffScreenRenderWidgetHostView
   void UpdateFrameSinkIdRegistration() override;
   void InvalidateLocalSurfaceIdAndAllocationGroup() override;
   void ResetFallbackToFirstNavigationSurface() override;
+  void OnUnconfirmedTapConvertedToTap() override {}
   void InitAsPopup(content::RenderWidgetHostView* parent_host_view,
                    const gfx::Rect& bounds,
                    const gfx::Rect& anchor_rect) override;