Chrome Version       : 53.0.2785.8
OS Version: 
URLs (if applicable) :
Other browsers tested:
  Add OK or FAIL after other browsers where you have tested this issue:
     Safari 5:
  Firefox 4.x:
     IE 7/8/9:

What steps will reproduce the problem?
1. Install https://chrome.google.com/webstore/detail/rietveld-usability-toolki/nmljjlfbnbekmadhbpfpkcminoejelga
2. Load a code review like https://codereview.chromium.org/2096293002/
3. Click "Show All" to expand all the diffs inline.
4. Search for the string ".mojom" (no quotes)

What is the expected result?
Find next should jump inside the inline diff (in an iframe) if the iframe is 'logically' next.

What happens instead of that?
Find next cycles through all the hits in the main frame, then starts cycling through hits in the iframes.

Please provide any additional information below. Attach a screenshot if
possible.

UserAgentString: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.8 Safari/537.36


(Note that I'm finding this very convenient, but I don't recall if this was an intentional behavior change or not?)