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

chrome/test/data/extensions/api_test/mime_handler_view/index.js

Index: chrome/test/data/extensions/api_test/mime_handler_view/index.js
diff --git a/chrome/test/data/extensions/api_test/mime_handler_view/index.js b/chrome/test/data/extensions/api_test/mime_handler_view/index.js
index b3187d2aded3d5e4cc5f9386ad4cddfed43e3122..e53465d96ae748f86ddc188ec6fd22b13cd525bb 100644
--- a/chrome/test/data/extensions/api_test/mime_handler_view/index.js
+++ b/chrome/test/data/extensions/api_test/mime_handler_view/index.js
@@ -15,6 +15,17 @@ function queueMessage(event) {
 
 window.addEventListener('message', queueMessage, false);
 
+let mimeHandlerPromise = (async function() {
+  let [frameInterfaces, mojom, connectionModule] = await Promise.all([
+    chrome.mojoPrivate.requireAsync('content/public/renderer/frame_interfaces'),
+    chrome.mojoPrivate.requireAsync('extensions/common/api/mime_handler.mojom'),
+    chrome.mojoPrivate.requireAsync('mojo/public/js/connection'),
+  ]);
+  return connectionModule.bindHandleToProxy(
+      frameInterfaces.getInterface(mojom.MimeHandlerService.name),
+      mojom.MimeHandlerService);
+})();
+
 var streamDetails;
 
 function fetchUrl(url) {
@@ -84,14 +95,15 @@ var tests = [
     Promise.all([printMessageArrived, contentRead]).then(chrome.test.succeed);
   },
 
-  function testAbort() {
+  async function testAbort() {
     checkStreamDetails('testAbort.csv', false);
-    chrome.mimeHandlerPrivate.abortStream(function() {
-      fetchUrl(streamDetails.streamUrl).then(function(response) {
-        chrome.test.assertEq(404, response.status);
-        chrome.test.assertEq('', response.data);
-        chrome.test.succeed();
-      });
+
+    let mimeHandlerInterface = await mimeHandlerPromise;
+    await mimeHandlerInterface.abortStream();
+    fetchUrl(streamDetails.streamUrl).then(function(response) {
+      chrome.test.assertEq(404, response.status);
+      chrome.test.assertEq('', response.data);
+      chrome.test.succeed();
     });
   },
 
@@ -152,7 +164,25 @@ for (let i = 0; i < tests.length; i++) {
   testsByName[tests[i].name] = tests[i];
 }
 
-chrome.mimeHandlerPrivate.getStreamInfo(function(streamInfo) {
+function constructStreamInfoDict_(streamInfo) {
+  var headers = {};
+  for (var header of streamInfo.response_headers) {
+    headers[header[0]] = header[1];
+  }
+  return {
+    mimeType: streamInfo.mime_type,
+    originalUrl: streamInfo.original_url,
+    streamUrl: streamInfo.stream_url,
+    tabId: streamInfo.tab_id,
+    embedded: !!streamInfo.embedded,
+    responseHeaders: headers,
+  };
+}
+
+(async function() {
+  let mimeHandlerInterface = await mimeHandlerPromise;
+  let streamInfo = constructStreamInfoDict_(
+      (await mimeHandlerInterface.getStreamInfo()).stream_info);
   if (!streamInfo)
     return;
 
@@ -175,4 +205,4 @@ chrome.mimeHandlerPrivate.getStreamInfo(function(streamInfo) {
     else
       chrome.test.runTests([testsByName['testDataUrl']]);
   }
-});
+})();