[ObjC ARC] Converts ios/chrome/browser/ui:eg_tests to ARC.

ios/chrome/browser/ui/fullscreen_egtest.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 <EarlGrey/EarlGrey.h>
 #import <UIKit/UIKit.h>
 #import <XCTest/XCTest.h>
 
 #include "base/ios/ios_util.h"
 #include "base/mac/bind_objc_block.h"
@@ skipping 10 matching lines @@
 #import "ios/chrome/test/earl_grey/chrome_test_case.h"
 #import "ios/chrome/test/earl_grey/chrome_util.h"
 #import "ios/testing/wait_util.h"
 #import "ios/web/public/test/earl_grey/web_view_matchers.h"
 #import "ios/web/public/test/http_server.h"
 #import "ios/web/public/test/http_server_util.h"
 #import "ios/web/public/test/response_providers/error_page_response_provider.h"
 #import "ios/web/public/test/web_view_interaction_test_util.h"
 #include "url/gurl.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 // TODO(crbug.com/638674): Move this to a shared location as it is a duplicate
 // of ios/web/shell/test/page_state_egtest.mm.
 // Returns a matcher for asserting that element's content offset matches the
 // given |offset|.
 id<GREYMatcher> ContentOffset(CGPoint offset) {
   MatchesBlock matches = ^BOOL(UIScrollView* element) {
     return CGPointEqualToPoint([element contentOffset], offset);
   };
@@ skipping 132 matching lines @@
       "  if (metas[i].getAttribute('name') == 'viewport') {"
       "    metas[i].setAttribute('content', 'width=10');"
       "    return;"
       "  }"
       "}"
       "document.body.innerHTML += \"<meta name='viewport' content='width=10'>\""
       "})()";
 
   __block bool finished = false;
   chrome_test_util::GetCurrentWebState()->ExecuteJavaScript(
-      base::UTF8ToUTF16(script), base::BindBlock(^(const base::Value*) {
+      base::UTF8ToUTF16(script), base::BindBlockArc(^(const base::Value*) {
         finished = true;
       }));
 
   GREYAssert(testing::WaitUntilConditionOrTimeout(1.0,
                                                   ^{
                                                     return finished;
                                                   }),
              @"JavaScript to hide the toolbar did not complete");
 
   // Scroll up to be sure the toolbar can be dismissed by scrolling down.
@@ skipping 208 matching lines @@
   [ChromeEarlGrey loadURL:URL];
   HideToolbarUsingUI();
   chrome_test_util::AssertToolbarNotVisible();
 
   chrome_test_util::TapWebViewElementWithId("link");
   AssertURLIs(ErrorPageResponseProvider::GetDnsFailureUrl());
   chrome_test_util::AssertToolbarVisible();
 }
 
 @end