Remove legacy StartsWithASCII function.

content/child/simple_webmimeregistry_impl.cc

 // 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.
 
 #include "content/child/simple_webmimeregistry_impl.h"
 
 #include "base/files/file_path.h"
 #include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 24 matching lines @@
   return mime_util::IsSupportedImageMimeType(ToASCIIOrEmpty(mime_type))
              ? WebMimeRegistry::IsSupported
              : WebMimeRegistry::IsNotSupported;
 }
 
 WebMimeRegistry::SupportsType
     SimpleWebMimeRegistryImpl::supportsImagePrefixedMIMEType(
     const WebString& mime_type) {
     std::string ascii_mime_type = ToASCIIOrEmpty(mime_type);
     return (mime_util::IsSupportedImageMimeType(ascii_mime_type) ||
-            (base::StartsWithASCII(ascii_mime_type, "image/", true) &&
+            (base::StartsWith(ascii_mime_type, "image/",
+                              base::CompareCase::SENSITIVE) &&
              mime_util::IsSupportedNonImageMimeType(ascii_mime_type)))
                ? WebMimeRegistry::IsSupported
                : WebMimeRegistry::IsNotSupported;
 }
 
 WebMimeRegistry::SupportsType
     SimpleWebMimeRegistryImpl::supportsJavaScriptMIMEType(
     const WebString& mime_type) {
   return mime_util::IsSupportedJavascriptMimeType(ToASCIIOrEmpty(mime_type))
              ? WebMimeRegistry::IsSupported
@@ skipping 43 matching lines @@
 
 WebString SimpleWebMimeRegistryImpl::mimeTypeFromFile(
     const WebString& file_path) {
   std::string mime_type;
   net::GetMimeTypeFromFile(base::FilePath::FromUTF16Unsafe(file_path),
                            &mime_type);
   return WebString::fromUTF8(mime_type);
 }
 
 }  // namespace content