roll chromium from 1:48 to 2:59 may 24 revision.

contains the following changes in chromium:
https://chromium.googlesource.com/chromium/src/+log/2a818f54..aa5126ff

some trybot scripts failing.  build bots green before roll.  Will see if commit causes build bot failure.

TBR=kjellander@chromium.org
BUG=libyuv:626

Review URL: https://codereview.chromium.org/2147153004 .

DEPS

@@ -7,7 +7,7 @@ vars = {
 
   # Roll the Chromium Git hash to pick up newer versions of all the
   # dependencies and tools linked to in setup_links.py.
-  'chromium_revision': '2a818f54130d8c93f81490adce5a1e87307bf5f0',
+  'chromium_revision': 'aa5126ff66379a9060e87b010135f1aee7fc1ab2',
 }
 
 # NOTE: Prefer revision numbers to tags for svn deps. Use http rather than