whitespace: to test git-numberer is working.

TBR=pkasting

Bug: 872722
Change-Id: Iffb249c1d61d468ac8f301b4808049e03ab52127
Reviewed-on: https://chromium-review.googlesource.com/1169912Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581888}

build/whitespace_file.txt

@@ -174,4 +174,5 @@ Mistakes are the best sometimes.
 This is groovy.
 
 SECRET ENDING: IT WAS _____ ALL ALONG!
-testing trailing line
+testing trailing line.
+Hacky hacky mitigation.