Rename EarlGrey test classes with TestCase suffix.

ios/web/shell/test/pdf_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>
 
 #include "base/test/ios/wait_util.h"
 #include "ios/testing/earl_grey/wait_util.h"
 #import "ios/web/public/test/earl_grey/web_view_matchers.h"
 #import "ios/web/public/test/http_server.h"
@@ skipping 39 matching lines @@
                                            descriptionBlock:describe],
       nil);
 }
 
 }  // namespace
 
 using web::shell_test_util::LoadUrl;
 using web::test::HttpServer;
 
 // PDF test cases for the web shell.
-@interface PDFTest : ShellBaseTestCase
+@interface PDFTestCase : ShellBaseTestCase
 @end
 
-@implementation PDFTest
+@implementation PDFTestCase
 
 // Tests MIME type of the loaded PDF document.
 - (void)testMIMEType {
   web::test::SetUpFileBasedHttpServer();
   LoadUrl(HttpServer::MakeUrl(kTestPDFURL));
   [[EarlGrey selectElementWithMatcher:webViewWithPdf()]
       assertWithMatcher:grey_notNil()];
 }
 
 @end