Remove reference to yasm in unbundle's replace_gn_files.py.

yasm is no longer used in Chromium, remove a lingering reference to it.

Bug: 766721
Change-Id: I8043e1e089af09e740d4db7ea7119e47d1f8f198
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352938Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Cr-Commit-Position: refs/heads/master@{#797888}

build/linux/unbundle/replace_gn_files.py

@@ -35,7 +35,6 @@ REPLACEMENTS = {
   'opus': 'third_party/opus/BUILD.gn',
   're2': 'third_party/re2/BUILD.gn',
   'snappy': 'third_party/snappy/BUILD.gn',
-  'yasm': 'third_party/yasm/yasm_assemble.gni',
   'zlib': 'third_party/zlib/BUILD.gn',
 }