Roll src/third_party/libjpeg_turbo/ 61a2bbaa9..2de84a43e (5 commits)

https://chromium.googlesource.com/chromium/deps/libjpeg_turbo.git/+log/61a2bbaa9aec..2de84a43e683

$ git log 61a2bbaa9..2de84a43e --date=short --no-merges --format='%ad %ae %s'
2019-04-18 cblume Pull comments from upstream
2019-04-16 cblume libjpeg_turbo: Fix GN check
2019-04-16 cblume Check maximum CPUID leaf
2019-03-04 jmadill Fix gn header check.
2019-03-01 cblume Update libjpeg-turbo to v2.0.1

This CL also updates our expected pixel results to reflect an
imperceptible change in 4:4:0 decoding. This change is the
result of 4:4:0 now having fancy upsampling.

R=scroggo@chromium.org

Bug: 922430
Change-Id: I97b3269286dd6464cb731e5ca9dad355925a3925
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1496758
Commit-Queue: Chris Blume <cblume@chromium.org>
Reviewed-by: Leon Scroggins <scroggo@chromium.org>
Auto-Submit: Chris Blume <cblume@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652744}

DEPS

@@ -1051,7 +1051,7 @@ deps = {
   },
 
   'src/third_party/libjpeg_turbo':
-    Var('chromium_git') + '/chromium/deps/libjpeg_turbo.git' + '@' + '61a2bbaa9aec89cb2c882d87ace6aba9aee49bb9',
+    Var('chromium_git') + '/chromium/deps/libjpeg_turbo.git' + '@' + '2de84a43e683c2c3c8ff4922da16b9053f024144',
 
   'src/third_party/liblouis/src': {
       'url': Var('chromium_git') + '/external/liblouis-github.git' + '@' + '97ce1c67fccbd3668291b7e63c06161c095d49f2',