Added crnet_framework target to build CrNet dynamic framework.

ios/crnet/crnet_environment.mm

 // 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.
 
 #include "ios/crnet/crnet_environment.h"
 
 #import <Foundation/Foundation.h>
 
 #include <utility>
 
@@ skipping 349 matching lines @@
                                       ofType:@"bundle"];
   NSBundle* bundle = [NSBundle bundleWithPath:bundlePath];
   NSString* acceptableLanguages = NSLocalizedStringWithDefaultValue(
       @"IDS_ACCEPT_LANGUAGES",
       @"Localizable",
       bundle,
       @"en-US,en",
       @"These values are copied from Chrome's .xtb files, so the same "
        "values are used in the |Accept-Language| header. Key name matches "
        "Chrome's.");
-  DCHECK(acceptableLanguages);
+  if (acceptableLanguages == Nil)
+    acceptableLanguages = @"en-US,en";
   std::string acceptable_languages =
       [acceptableLanguages cStringUsingEncoding:NSUTF8StringEncoding];
   std::string user_agent =
       web::BuildUserAgentFromProduct(user_agent_product_name_);
   // Set the user agent through NSUserDefaults. This sets it for both
   // UIWebViews and WKWebViews, and javascript calls to navigator.userAgent
   // return this value.
   [[NSUserDefaults standardUserDefaults] registerDefaults:@{
     @"UserAgent" : [NSString stringWithUTF8String:user_agent.c_str()]
   }];
@@ skipping 98 matching lines @@
 
   return user_agent_settings->GetUserAgent();
 }
 
 void CrNetEnvironment::ClearCache(ClearCacheCallback callback) {
   PostToNetworkThread(
       FROM_HERE,
       base::Bind(&net::ClearHttpCache, main_context_getter_,
                  network_io_thread_->task_runner(), base::BindBlock(callback)));
 }