Revert of [ios] Move WebStateList to ios/chrome/browser/web_state_list.

ios/chrome/browser/web_state_list/web_state_list_fast_enumeration_helper_unittest.mm

Index: ios/chrome/browser/web_state_list/web_state_list_fast_enumeration_helper_unittest.mm
diff --git a/ios/chrome/browser/web_state_list/web_state_list_fast_enumeration_helper_unittest.mm b/ios/chrome/browser/web_state_list/web_state_list_fast_enumeration_helper_unittest.mm
deleted file mode 100644
index c3209fa4c86b655c52e636960de7c75a56ad34bc..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/web_state_list/web_state_list_fast_enumeration_helper_unittest.mm
+++ /dev/null
@@ -1,101 +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.
-
-#import "ios/chrome/browser/web_state_list/web_state_list_fast_enumeration_helper.h"
-
-#include "base/macros.h"
-#include "base/memory/ptr_util.h"
-#import "ios/chrome/browser/web_state_list/fake_web_state_list_delegate.h"
-#import "ios/chrome/browser/web_state_list/web_state_list.h"
-#import "ios/web/public/test/fakes/test_web_state.h"
-#import "net/base/mac/url_conversions.h"
-#include "testing/gtest/include/gtest/gtest.h"
-#include "testing/gtest_mac.h"
-#include "testing/platform_test.h"
-#include "url/gurl.h"
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-namespace {
-const char kURL0[] = "https://chromium.org/0";
-const char kURL1[] = "https://chromium.org/1";
-const char kURL2[] = "https://chromium.org/2";
-const char* const kURLs[] = {kURL0, kURL1, kURL2};
-}  // namespace
-
-@interface WebStateProxyFactoryForWebStateListFastEnumerationHelperTest
-    : NSObject<WebStateProxyFactory>
-@end
-
-@implementation WebStateProxyFactoryForWebStateListFastEnumerationHelperTest
-
-- (id)proxyForWebState:(web::WebState*)webState {
-  return net::NSURLWithGURL(webState->GetVisibleURL());
-}
-
-@end
-
-class WebStateListFastEnumerationHelperTest : public PlatformTest {
- public:
-  WebStateListFastEnumerationHelperTest()
-      : web_state_list_(&web_state_list_delegate_) {}
-
-  NSArray* ArrayFromWebStateList() {
-    id<WebStateProxyFactory> proxy =
-        [[WebStateProxyFactoryForWebStateListFastEnumerationHelperTest alloc]
-            init];
-    WebStateListFastEnumerationHelper* helper =
-        [[WebStateListFastEnumerationHelper alloc]
-            initWithWebStateList:&web_state_list_
-                    proxyFactory:proxy];
-    NSMutableArray* array = [NSMutableArray array];
-    for (id wrapper in helper) {
-      // NSArray* cannot store a nil pointer. The NSFastEnumeration protocol
-      // allows returning nil as one of the value in the iterated container,
-      // so skip the value in that case (see NilWrapper test).
-      if (wrapper)
-        [array addObject:wrapper];
-    }
-    return [array copy];
-  }
-
-  void InsertTestWebStateForURLs(const char* const* urls, size_t count) {
-    for (size_t index = 0; index < count; ++index) {
-      auto test_web_state = base::MakeUnique<web::TestWebState>();
-      test_web_state->SetCurrentURL(GURL(urls[index]));
-
-      web_state_list_.InsertWebState(web_state_list_.count(),
-                                     std::move(test_web_state));
-    }
-  }
-
- private:
-  FakeWebStateListDelegate web_state_list_delegate_;
-  WebStateList web_state_list_;
-
-  DISALLOW_COPY_AND_ASSIGN(WebStateListFastEnumerationHelperTest);
-};
-
-TEST_F(WebStateListFastEnumerationHelperTest, Empty) {
-  NSArray* array = ArrayFromWebStateList();
-  EXPECT_EQ(0u, [array count]);
-}
-
-TEST_F(WebStateListFastEnumerationHelperTest, FastEnumeration) {
-  InsertTestWebStateForURLs(kURLs, arraysize(kURLs));
-  NSArray* array = ArrayFromWebStateList();
-  ASSERT_EQ(arraysize(kURLs), [array count]);
-  for (size_t index = 0; index < arraysize(kURLs); ++index) {
-    EXPECT_NSEQ([NSURL URLWithString:@(kURLs[index])], array[index]);
-  }
-}
-
-TEST_F(WebStateListFastEnumerationHelperTest, NilWrapper) {
-  const char* const urls[] = {""};
-  InsertTestWebStateForURLs(urls, arraysize(urls));
-  NSArray* array = ArrayFromWebStateList();
-  ASSERT_EQ(0u, [array count]);
-}