Move MIME related platform files under network/mime

third_party/WebKit/Source/platform/network/mime/MIMETypeFromURL.cpp

+// 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.
+
+#include "platform/network/mime/MIMETypeFromURL.h"
+
+#include "platform/network/mime/MIMETypeRegistry.h"
+#include "platform/weborigin/KURL.h"
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+String mimeTypeFromDataURL(const String& url) {
+  DCHECK(protocolIs(url, "data"));
+  size_t index = url.find(';');
+  if (index == kNotFound)
+    index = url.find(',');
+  if (index != kNotFound) {
+    if (index > 5)
+      return url.substring(5, index - 5).lower();
+    // Data URLs with no MIME type are considered text/plain.
+    return "text/plain";
+  }
+  return "";
+}
+
+String mimeTypeFromURL(const KURL& url) {
+  String decodedPath = decodeURLEscapeSequences(url.path());
+  String extension = decodedPath.substring(decodedPath.reverseFind('.') + 1);
+
+  // We don't use MIMETypeRegistry::getMIMETypeForPath() because it returns
+  // "application/octet-stream" upon failure
+  return MIMETypeRegistry::getMIMETypeForExtension(extension);
+}
+
+}  // namespace blink