[ios clean] Updates all BrowserCoordinator to the new rule

ios/shared/chrome/browser/coordinator_context/BUILD.gn

Index: ios/shared/chrome/browser/coordinator_context/BUILD.gn
diff --git a/ios/shared/chrome/browser/coordinator_context/BUILD.gn b/ios/shared/chrome/browser/coordinator_context/BUILD.gn
deleted file mode 100644
index 4f3f5c29929b432f6a0a2c45b4b75c157aa7913f..0000000000000000000000000000000000000000
--- a/ios/shared/chrome/browser/coordinator_context/BUILD.gn
+++ /dev/null
@@ -1,24 +0,0 @@
-# Copyright 2017 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-source_set("coordinator_context") {
-  sources = [
-    "coordinator_context.h",
-    "coordinator_context.mm",
-  ]
-  configs += [ "//build/config/compiler:enable_arc" ]
-  libs = [ "UIKit.framework" ]
-}
-
-source_set("unit_tests") {
-  testonly = true
-  sources = [
-    "coordinator_context_unittest.mm",
-  ]
-  deps = [
-    ":coordinator_context",
-    "//testing/gtest",
-  ]
-  configs += [ "//build/config/compiler:enable_arc" ]
-}