[ios] Moved all web mocks to ios/web/public/test/fakes.

ios/web/public/test/test_native_content_provider.mm

-// Copyright 2016 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 "ios/web/public/test/test_native_content_provider.h"
-
-#include <map>
-
-#include "url/gurl.h"
-
-@implementation TestNativeContentProvider {
-  std::map<GURL, id<CRWNativeContent>> _nativeContent;
-}
-
-- (void)setController:(id<CRWNativeContent>)controller forURL:(const GURL&)URL {
-  _nativeContent[URL] = controller;
-}
-
-- (BOOL)hasControllerForURL:(const GURL&)URL {
-  return _nativeContent.find(URL) != _nativeContent.end();
-}
-
-- (id<CRWNativeContent>)controllerForURL:(const GURL&)URL {
-  auto nativeContent = _nativeContent.find(URL);
-  if (nativeContent == _nativeContent.end()) {
-    return nil;
-  }
-  return nativeContent->second;
-}
-
-- (id<CRWNativeContent>)controllerForURL:(const GURL&)URL
-                               withError:(NSError*)error
-                                  isPost:(BOOL)isPost {
-  NOTREACHED();
-  return nil;
-}
-
-@end