Implement chrome.streamsPrivate.abort() extensions function

chrome/common/extensions/api/streams_private.idl

Index: chrome/common/extensions/api/streams_private.idl
diff --git a/chrome/common/extensions/api/streams_private.idl b/chrome/common/extensions/api/streams_private.idl
index 2d3badaa9a225760c474a66f5148ae817ce18ced..c9d8cceac9155c69686014f740830437df440ae8 100644
--- a/chrome/common/extensions/api/streams_private.idl
+++ b/chrome/common/extensions/api/streams_private.idl
@@ -29,6 +29,12 @@ namespace streamsPrivate {
     object responseHeaders;
   };
 
+  interface Functions {
+    // Abort the URL request on the given stream.
+    // |streamUrl| : The URL of the stream to abort.
+    static void abort(DOMString streamUrl);
+  };
+
   interface Events {
     // Fired when a resource is fetched which matches a mime type handled by
     // this extension. The resource request is cancelled, and the extension is