Revert "Tab Search: Add last_active_time_ticks to tab_search.mojom.Tab"

This reverts commit 44326d9d.

Reason for revert: Suspect in https://ci.chromium.org/p/chrome/builders/ci/linux-chromeos-chrome/8371
Deterministic failure: TabSearchAppTest.All (status FAILURE)

Original change's description:
> Tab Search: Add last_active_time_ticks to tab_search.mojom.Tab
> 
> last_active_time_ticks is used to sort recent tabs.
> 
> Bug: 1099917
> Change-Id: If5c224729e39c20ceda48a3d81b6e171b92be731
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2382655
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Thomas Lukaszewicz <tluk@chromium.org>
> Commit-Queue: Yuheng Huang <yuhengh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#805629}

TBR=dcheng@chromium.org,tluk@chromium.org,yuhengh@chromium.org

Change-Id: I9f1122dbb9cd1c6ecda5751744fceaaea742905c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1099917
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2402938Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805654}

chrome/browser/ui/webui/tab_search/BUILD.gn

@@ -6,5 +6,4 @@ import("//mojo/public/tools/bindings/mojom.gni")
 
 mojom("mojo_bindings") {
   sources = [ "tab_search.mojom" ]
-  public_deps = [ "//mojo/public/mojom/base" ]
 }

chrome/browser/ui/webui/tab_search/tab_search.mojom

@@ -4,8 +4,6 @@
 
 module tab_search.mojom;
 
-import "mojo/public/mojom/base/time.mojom";
-
 // Collection of WindowTabs of a profile.
 struct ProfileTabs {
   array<WindowTabs> windows;
@@ -29,7 +27,6 @@ struct Tab {
   string? fav_icon_url;
   bool is_default_favicon;
   bool show_icon;
-  mojo_base.mojom.TimeTicks last_active_time_ticks;
 };
 
 // Collection of tab groups.

chrome/browser/ui/webui/tab_search/tab_search_page_handler.cc

@@ -185,7 +185,6 @@ tab_search::mojom::TabPtr TabSearchPageHandler::GetTabData(
             favicon::GetDefaultFavicon().AsImageSkia());
   }
   tab_data->show_icon = tab_renderer_data.show_icon;
-  tab_data->last_active_time_ticks = contents->GetLastActiveTime();
 
   return tab_data;
 }

chrome/browser/ui/webui/tab_search/tab_search_page_handler_unittest.cc

@@ -63,7 +63,6 @@ void ExpectNewTab(const tab_search::mojom::Tab* tab,
   EXPECT_TRUE(tab->fav_icon_url.has_value());
   EXPECT_TRUE(tab->is_default_favicon);
   EXPECT_TRUE(tab->show_icon);
-  EXPECT_GT(tab->last_active_time_ticks, base::TimeTicks());
 }
 
 void ExpectProfileTabs(tab_search::mojom::ProfileTabs* profile_tabs) {