Chrome Version: <From about:version: Version 51.0.2704.63 (64-bit)>
<b>Chrome OS Version: <From about:version: Platform x.x.x.x></b>
<b>Chrome OS Platform: <Make/model of computer running Chrome OS></b>
<b>Network info: <network, encryption type, router model (if known)></b>

Please specify Cr-* of the system to which this bug/feature applies (add
the label below).

Steps To Reproduce:
(1) Open any page. Copy any two lines.
(2) Search and copy those two lines into the search box
(3) No result found because backspace has been coded into different char, I guess, in the search box.

Expected Result:
Two lines found because the content was copied directly in this page.

Actual Result:
No result found.

How frequently does this problem reproduce? (Always, sometimes, hard to
reproduce?)
Always.

What is the impact to the user, and is there a workaround? If so, what is
it?
Might be big impact in internal usage. I found it when using code search and search two line code in current page but found nothing.

Please provide any additional information below. Attach a screen shot or
log if possible.
The behavior must have been changed in recent update. Because I am relying on the behavior in my everyday work.