Revert "Add desktop focus state change event"

This reverts commit 55c31ae8.

Reason for revert: Supect this is causing ARC failures in chrome_all_tast_tests (https://ci.chromium.org/p/chrome/builders/ci/chromeos-eve-chrome/11172)

Original change's description:
> Add desktop focus state change event
>
> This change add a new event for desktop window focus state change.
> With this change, ARC can have different behavior when Chrome window
> or ChromeOS desktop get activated.
>
> BUG=b:171450038
> TEST=Active different window between Chrome/ARC and logcat events
>
> Change-Id: I11cee5d5279ad12524092518cadd05fff67bab72
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2519686
> Commit-Queue: Shengsong Tan <sstan@google.com>
> Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#827122}

TBR=oshima@chromium.org,sstan@google.com

Change-Id: I20b7407b417b3d54fb6b29dfb08de640592f1b21
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b:171450038
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2538115Reviewed-by: Adithya Srinivasan <adithyas@chromium.org>
Commit-Queue: Adithya Srinivasan <adithyas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827410}

components/exo/wayland/zcr_remote_shell.cc

@@ -1133,18 +1133,6 @@ class WaylandRemoteShell : public ash::TabletModeObserver,
       lost_active_surface_resource = nullptr;
     }
 
-    uint32_t focus_state;
-    if (gained_active_surface_resource) {
-      focus_state = ZCR_REMOTE_SHELL_V1_DESKTOP_FOCUS_STATE_CLIENT_FOCUSED;
-    } else if (gained_active) {
-      focus_state = ZCR_REMOTE_SHELL_V1_DESKTOP_FOCUS_STATE_OTHER_CLIENT_FOCUSED;
-    } else {
-      focus_state = ZCR_REMOTE_SHELL_V1_DESKTOP_FOCUS_STATE_NO_FOCUS;
-    }
-
-    zcr_remote_shell_v1_send_desktop_focus_state_changed(remote_shell_resource_,
-                                                         focus_state);
-
     zcr_remote_shell_v1_send_activated(remote_shell_resource_,
                                        gained_active_surface_resource,
                                        lost_active_surface_resource);

third_party/wayland-protocols/unstable/remote-shell/remote-shell-unstable-v1.xml

@@ -38,7 +38,7 @@
     reset.
   </description>
 
-  <interface name="zcr_remote_shell_v1" version="30">
+  <interface name="zcr_remote_shell_v1" version="29">
     <description summary="remote_shell">
       The global interface that allows clients to turn a wl_surface into a
       "real window" which is remotely managed but can be stacked, activated
@@ -274,24 +274,6 @@
       <arg name="use_default_device_scale_factor" type="int" summary="0 if false"/>
     </request>
 
-    <!-- Version 30 additions -->
-
-    <enum name="desktop_focus_state">
-      <description summary="desktop foucs state">
-	Desktop client window focus state.
-      </description>
-      <entry name="no_focus" value="1" summary="no window get focused"/>
-      <entry name="client_focused" value="2" summary="client window get focused"/>
-      <entry name="other_client_focused" value="3" summary="other client window get focused"/>
-    </enum>
-
-    <event name="desktop_focus_state_changed" since="30">
-      <description summary="desktop window focus state change">
-	Notifies client that the window focus state change.
-      </description>
-      <arg name="focus_state" type="uint"/>
-    </event>
-
   </interface>
 
   <interface name="zcr_remote_surface_v1" version="27">