Surface synchronization: Remove auto_resize_sequence_number

It's not used anymore.

Bug: 672962
TBR: tsepez@chromium.org
Change-Id: I7e1485259d42a3396337db0d54a1c9f4ab561b01
Reviewed-on: https://chromium-review.googlesource.com/1029128Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553869}

content/common/view_messages.h

@@ -166,7 +166,6 @@ IPC_STRUCT_TRAITS_BEGIN(content::VisualProperties)
   IPC_STRUCT_TRAITS_MEMBER(auto_resize_enabled)
   IPC_STRUCT_TRAITS_MEMBER(min_size_for_auto_resize)
   IPC_STRUCT_TRAITS_MEMBER(max_size_for_auto_resize)
-  IPC_STRUCT_TRAITS_MEMBER(auto_resize_sequence_number)
   IPC_STRUCT_TRAITS_MEMBER(new_size)
   IPC_STRUCT_TRAITS_MEMBER(compositor_viewport_pixel_size)
   IPC_STRUCT_TRAITS_MEMBER(browser_controls_shrink_blink_size)

content/common/visual_properties.h

@@ -33,11 +33,6 @@ struct CONTENT_EXPORT VisualProperties {
   // The maximum size for Blink if auto-resize is enabled.
   gfx::Size max_size_for_auto_resize;
 
-  // This variable is increased after each auto-resize. If the
-  // renderer receives a VisualProperties with stale auto_resize_seqence_number,
-  // then the resize request is dropped.
-  uint64_t auto_resize_sequence_number = 0u;
-
   // The size for the widget in DIPs.
   gfx::Size new_size;