Add condition attribute for MIME media types from Content-Type header.

chrome/test/data/extensions/api_test/webrequest/test_declarative.js

 // Copyright (c) 2012 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.
 
 var onRequest = chrome.declarativeWebRequest.onRequest;
 var AddResponseHeader =
     chrome.declarativeWebRequest.AddResponseHeader;
 var RequestMatcher = chrome.declarativeWebRequest.RequestMatcher;
 var CancelRequest = chrome.declarativeWebRequest.CancelRequest;
 var RedirectByRegEx = chrome.declarativeWebRequest.RedirectByRegEx;
@@ skipping 27 matching lines @@
 function getURLHttpComplex() {
   return getServerURL(
       "files/extensions/api_test/webrequest/complexLoad/a.html");
 }
 
 function getURLHttpRedirectTest() {
   return getServerURL(
       "files/extensions/api_test/webrequest/declarative/a.html");
 }
 
+function getURLHttpWithHeaders() {
+  return getServerURL(
+      "files/extensions/api_test/webrequest/declarative/headers.html");
+}
+
 function getURLSetCookie() {
   return getServerURL('set-cookie?Foo=Bar');
 }
 
 function getURLHttpXHRData() {
   return getServerURL("files/extensions/api_test/webrequest/xhr/data.json",
                       "b.com");
 }
 function getURLHttpSimpleOnB() {
   return getServerURL("files/extensions/api_test/webrequest/simpleLoad/a.html",
                       "b.com");
 }
 
 runTests([
 
   function testCancelRequest() {
     ignoreUnexpected = true;
     expect(
       [
         { label: "onErrorOccurred",
           event: "onErrorOccurred",
           details: {
-            url: getURLHttpSimple(),
+            url: getURLHttpWithHeaders(),
             fromCache: false,
             error: "net::ERR_BLOCKED_BY_CLIENT"
           }
         },
       ],
       [ ["onErrorOccurred"] ]);
     onRequest.addRules(
       [ {'conditions': [
            new RequestMatcher({
              'url': {
                  'pathSuffix': ".html",
                  'ports': [testServerPort, [1000, 2000]],
                  'schemes': ["http"]
              },
-             'resourceType': ["main_frame"]})],
+             'resourceType': ["main_frame"],
+             'contentType': ["text/html"]})],
          'actions': [new CancelRequest()]}
       ],
-      function() {navigateAndWait(getURLHttpSimple());}
+      function() {navigateAndWait(getURLHttpWithHeaders());}
     );
   },
 
   function testRedirectRequest() {
     ignoreUnexpected = true;
     expect(
       [
         { label: "onBeforeRequest-a",
           event: "onBeforeRequest",
           details: {
@@ skipping 271 matching lines @@
             }
           }
           req.open("GET", getURLHttpXHRData(), asynchronous);
           req.send(null);
         });
       }
     );
   },
 
   ]);