Remove legacy StartsWithASCII function.

ios/net/clients/crn_forwarding_network_client_factory_unittest.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.
 
 #import <Foundation/Foundation.h>
 #import <objc/runtime.h>
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 124 matching lines @@
   // Look at every known class and find those that are subclasses of
   // |factory_superclass|.
   int class_count = objc_getClassList(nullptr, 0);
   Class* classes = nullptr;
   classes = static_cast<Class*>(malloc(sizeof(Class) * class_count));
   class_count = objc_getClassList(classes, class_count);
 
   for (NSInteger i = 0; i < class_count; i++) {
     std::string class_name = class_getName(classes[i]);
     // Skip the test classes defined above.
-    if (base::StartsWithASCII(class_name, "TestFactory", false))
+    if (base::StartsWith(class_name, "TestFactory",
+                         base::CompareCase::INSENSITIVE_ASCII))
       continue;
 
     Class subclass_super = classes[i];
     int subclassing_count = 0;
     // Walk up the class hiererchy from |classes[i]| to |factory_superclass|.
     do {
       subclass_super = class_getSuperclass(subclass_super);
       subclassing_count++;
     } while (subclass_super && subclass_super != factory_superclass);
 
@@ skipping 55 matching lines @@
     ASSERT_NE(0u, [subclass_implementations count])
         << class_name
         << " does not implement any required clientHandling methods.";
     ASSERT_EQ(1u, [subclass_implementations count])
         << class_name << " implements too many superclass methods ("
         << method_list << ").";
   }
 
   free(classes);
 }