Use mojo from the PDF extension instead of using an extension API.

extensions/common/api/mime_handler_private.idl

Index: extensions/common/api/mime_handler_private.idl
diff --git a/extensions/common/api/mime_handler_private.idl b/extensions/common/api/mime_handler_private.idl
deleted file mode 100644
index dfd47be6ae974f216483dace661b0f8e4a06fa39..0000000000000000000000000000000000000000
--- a/extensions/common/api/mime_handler_private.idl
+++ /dev/null
@@ -1,41 +0,0 @@
-// Copyright 2015 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.
-
-// Mime handler API.
-[nodoc] namespace mimeHandlerPrivate {
-  dictionary StreamInfo {
-    // The MIME type of the intercepted URL request.
-    DOMString mimeType;
-
-    // The original URL that was intercepted.
-    DOMString originalUrl;
-
-    // The URL that the stream can be read from.
-    DOMString streamUrl;
-
-    // The ID of the tab that opened the stream. If the stream is not opened in
-    // a tab, it will be -1.
-    long tabId;
-
-    // The HTTP response headers of the intercepted request stored as a
-    // dictionary mapping header name to header value. If a header name appears
-    // multiple times, the header values are merged in the dictionary and
-    // separated by a ", ". Non-ASCII headers are dropped.
-    object responseHeaders;
-
-    // Whether the stream is embedded within another document.
-    boolean embedded;
-  };
-
-  callback AbortCallback = void ();
-  callback GetStreamDetailsCallback = void (StreamInfo streamInfo);
-
-  interface Functions {
-    // Returns the StreamInfo for the stream for this context if there is one.
-    [nocompile] static void getStreamInfo(GetStreamDetailsCallback callback);
-
-    // Aborts the stream for this context if there is one.
-    [nocompile] static void abortStream(optional AbortCallback callback);
-  };
-};