[cr132] Browser companion has been deleted

The only references to this target were to disable features.

Chromium change:
https://chromium.googlesource.com/chromium/src/+/1b74bc8246cd7cab6a69466281de9a595b9a37e8

commit 1b74bc8246cd7cab6a69466281de9a595b9a37e8
Author: Juan Mojica <juanmojica@google.com>
Date:   Tue Oct 29 20:52:26 2024 +0000

    [companion] Remove remaining companion code.

    Histograms will be removed in a follow-up. This also does not
    remove chrome/browser/companion/text_finder/ directory as that
    code is used by some Android browser code.

    Change-Id: Ia98336080ff47a6edecd73be9c9205c71befba6d
    Bug: b:348678854

app/BUILD.gn

@@ -174,7 +174,6 @@ source_set("unit_tests") {
       "//brave/components/commands/common",
       "//chrome/app:command_ids",
       "//chrome/browser/apps/link_capturing:features",
-      "//chrome/browser/companion/core",
       "//chrome/common:chrome_features",
       "//components/translate/core/common",
       "//extensions/common",

app/feature_defaults_unittest.cc

@@ -9,7 +9,6 @@
 #include "base/features.h"
 #include "base/logging.h"
 #include "chrome/browser/browser_features.h"
-#include "chrome/browser/companion/core/features.h"
 #include "chrome/browser/devtools/features.h"
 #include "chrome/browser/preloading/preloading_features.h"
 #include "chrome/browser/ui/ui_features.h"
@@ -126,10 +125,6 @@ TEST(FeatureDefaultsTest, DisabledFeatures) {
       &content_settings::features::kTrackingProtection3pcd,
       &content_settings::features::kUserBypassUI,
 #if !BUILDFLAG(IS_ANDROID)
-      &companion::features::internal::
-          kCompanionEnabledByObservingExpsNavigations,
-      &companion::features::internal::kSidePanelCompanion,
-      &companion::features::internal::kSidePanelCompanion2,
       &enterprise_signals::features::kDeviceSignalsConsentDialog,
       &extensions_features::kExtensionManifestV2DeprecationWarning,
       &extensions_features::kExtensionManifestV2Unsupported,

chromium_src/chrome/browser/companion/core/features.cc

@@ -1,19 +0,0 @@
-/* Copyright (c) 2023 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at https://mozilla.org/MPL/2.0/. */
-
-#include "src/chrome/browser/companion/core/features.cc"
-
-#include "base/feature_override.h"
-
-namespace companion::features::internal {
-
-OVERRIDE_FEATURE_DEFAULT_STATES({{
-    {kCompanionEnabledByObservingExpsNavigations,
-     base::FEATURE_DISABLED_BY_DEFAULT},
-    {kSidePanelCompanion, base::FEATURE_DISABLED_BY_DEFAULT},
-    {kSidePanelCompanion2, base::FEATURE_DISABLED_BY_DEFAULT},
-}});
-
-}  // namespace companion::features::internal