
Reason for revert: Unit tests failing on Windows-7-SP1. https://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%28dbg%29%281%29/builds/47913 Original issue's description: > Base: add Optional<T>. > > This is an implementation of the C++17 std::optional<> feature: > http://en.cppreference.com/w/cpp/utility/optional > > Chromium documentation: > https://chromium.googlesource.com/chromium/src/+/master/docs/optional.md > > BUG=521269 > > Committed: https://crrev.com/8756e4f20df53bbb7fbb49b2ca19fda93a95bdb4 > Cr-Commit-Position: refs/heads/master@{#388187} TBR=danakj@chromium.org,dcheng@chromium.org,dmazzoni@chromium.org,horo@chromium.org,shivanisha@chromium.org,thakis@chromium.org,wfh@chromium.org,mlamouri@chromium.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=521269 Review URL: https://codereview.chromium.org/1902833002 Cr-Commit-Position: refs/heads/master@{#388216}
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