Drop support for Compact Language Detector v1.

components/translate/core/language_detection/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 
 source_set("language_detection") {
   sources = [
     "language_detection_util.cc",
     "language_detection_util.h",
   ]
 
   deps = [
     "//base",
     "//components/translate/core/common",
     "//url",
+    "//third_party/cld_2:cld2_platform_impl",
   ]
-
-  if (cld_version == 1) {
-    deps += [ "//third_party/cld" ]
-  } else if (cld_version == 2) {
-    deps += [ "//third_party/cld_2:cld2_platform_impl" ]
-  } else {
-    assert(false, "Need a CLD version")
-  }
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "language_detection_util_unittest.cc",
   ]
   deps = [
     ":language_detection",
     "//base",
     "//components/translate/core/common",
     "//testing/gtest",
     "//url",
   ]
 }