Roll src/third_party/libFuzzer/src/ a305a5eb8..2a5309858 (7 commits)

https://chromium.googlesource.com/chromium/llvm-project/compiler-rt/lib/fuzzer.git/+log/a305a5eb85ed..2a53098584c4

$ git log a305a5eb8..2a5309858 --date=short --no-merges --format='%ad %ae %s'
2018-11-06 metzman [fuzzer] Read files as binary
2018-11-06 kamil Follow Windows' approach for NetBSD in AlarmCallback()
2018-11-02 phosek [compiler-rt][Fuzzer] Fix the fuzzer test build
2018-10-31 phosek [compiler-rt][Fuzzer] Use the new C++ ABI namespace CMake support
2018-10-14 metzman [libfuzzer][Windows] Silence linker warning in unittest
2018-10-10 george.karpenkov [libFuzzer] Generalize the code for getting the previous offset for different architectures
2018-10-02 phosek [lib/fuzzer] Fix logging for Fuchsia

Created with:
  roll-dep src/third_party/libFuzzer/src

Bug: 902460
Change-Id: I82ef4e6e9b35371bb82d7b5d7ae3ae7080553965
Reviewed-on: https://chromium-review.googlesource.com/c/1321583Reviewed-by: Max Moroz <mmoroz@chromium.org>
Commit-Queue: Jonathan Metzman <metzman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605939}

DEPS

@@ -180,7 +180,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libFuzzer
   # and whatever else without interference from each other.
-  'libfuzzer_revision': 'a305a5eb85ed42edc5c965c14f308f576cb245ca',
+  'libfuzzer_revision': '2a53098584c48af50aec3fb51febe5e651489774',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling devtools-node-modules
   # and whatever else without interference from each other.