[cronet] Make getAcceptLanguages index a static table instead of the application bundle.

components/cronet/ios/test/cronet_acceptlang_test.mm

+// 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.
+
+// These tests are somewhat dependent on the exact contents of the
+// accept languages table generated at build-time.
+
+#import <Cronet/Cronet.h>
+#import <Foundation/Foundation.h>
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+@interface Cronet (ExposedForTesting)
++ (NSString*)getAcceptLanguagesFromPreferredLanguages:
+    (NSArray<NSString*>*)languages;
+@end
+
+namespace cronet {
+
+#define EXPECT_NSEQ(a, b) EXPECT_TRUE([(a) isEqual:(b)])
+
+TEST(AcceptLangTest, Region) {
+  NSString* acceptLangs =
+      [Cronet getAcceptLanguagesFromPreferredLanguages:@[ @"en-GB" ]];
+
+  EXPECT_NSEQ(acceptLangs, @"en-GB,en-US,en");
+}
+
+TEST(AcceptLangTest, Lang) {
+  NSString* acceptLangs =
+      [Cronet getAcceptLanguagesFromPreferredLanguages:@[ @"ja-JP" ]];
+
+  EXPECT_NSEQ(acceptLangs, @"ja,en-US,en");
+}
+
+TEST(AcceptLangTest, Default) {
+  NSString* acceptLangs =
+      [Cronet getAcceptLanguagesFromPreferredLanguages:@[ @"lol-LOL" ]];
+
+  EXPECT_NSEQ(acceptLangs, @"en-US,en");
+}
+
+TEST(AcceptLangTest, Append) {
+  NSString* acceptLangs =
+      [Cronet getAcceptLanguagesFromPreferredLanguages:@[ @"ja-JP", @"en-GB" ]];
+
+  EXPECT_NSEQ(acceptLangs, @"ja,en-US,en,en-GB");
+}
+
+TEST(AcceptLangTest, NoDefaultAppend) {
+  NSString* acceptLangs = [Cronet
+      getAcceptLanguagesFromPreferredLanguages:@[ @"en-GB", @"lol-LOL" ]];
+
+  NSLog(@"%@", acceptLangs);
+  EXPECT_NSEQ(acceptLangs, @"en-GB,en-US,en");
+}
+}