UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36

Steps to reproduce the problem:
1. Create an extension which listens for all webNavigation and webRequest events, logging them if details.url starts with "blob:". If it helps here's a gist https://gist.github.com/kzar/01ea05e4758f5edbeebf9d09766ce456 .
2. Add a second chrome.webNavigation.onCommitted listener that looks like this:

chrome.webNavigation.onCommitted.addListener(details =>
{
  if (details.url.startsWith("blob:"))
  {
    chrome.webNavigation.getFrame(
      {frameId: details.frameId, tabId: details.tabId},
      frame =>
      {
        console.log("Result of getFrame", frame,
                    "(frameId:", details.frameId, "tabId:", details.tabId, ")");
      }
    );
  }
});

3. Install the extension, open a new tab, open the console and paste this code to create a blob request:

let frame = document.createElement("iframe");
frame.src = URL.createObjectURL(new Blob([""]));
document.body.appendChild(frame)

What is the expected behavior?
Many of the webNavigation events, maybe even some of the webRequest events should fire for the blob request.

The chrome.webNavigation.onCommitted listener should successfully query for the frame using chrome.webNavigation.getFrame. From there it should have access to the frame's parent frame ID.

At the minimum the parentFrameId should be provided for onCommitted events like these!

What went wrong?
Only the chrome.webNavigation.onCommitted event is fired for the blob request.

The event does not provide the parentFrameId.

chrome.webNavigation.getFrame returns null for the blob request's frame, meaning that the extension cannot know that frame's parent frame ID.

The test function listed above logs something like this:

> Result of getFrame null (frameId: 469 tabId: 576 )

Did this work before? N/A 

Does this work in other browsers? N/A

Chrome version: 56.0.2924.87  Channel: stable
OS Version: Debian
Flash Version: N/A

This is a problem for Adblock Plus since websites use blob requests as a method of circumvention. We need to know the parent frame ID for blob requests in order to know what should be blocked. See https://issues.adblockplus.org/ticket/4891 for the related issue there.