Roll src/third_party/libFuzzer/src/ a2d200e6a..a305a5eb8 (2 commits)

https://chromium.googlesource.com/chromium/llvm-project/compiler-rt/lib/fuzzer.git/+log/a2d200e6a..a305a5eb8

$ git log a2d200e6a..a305a5eb8 --date=short --no-merges --format='%ad %ae %s'
2018-09-20 metzman [fuzzer] Replace FuzzerExtFunctionsDlsymWin.cpp with FuzzerExtFunctionsWeakAlias.cpp
2018-09-17 morehouse [libFuzzer] Avoid fuzzer symbols being hidden.


Bug: 884559
Change-Id: Iabcc2d7517171dc90626b0836953951b289f4322
Reviewed-on: https://chromium-review.googlesource.com/1239460
Commit-Queue: Jonathan Metzman <metzman@chromium.org>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594342}

DEPS

@@ -169,7 +169,7 @@ 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': 'a2d200e6a586f6e291572aafae08e49c71166a5a',
+  'libfuzzer_revision': 'a305a5eb85ed42edc5c965c14f308f576cb245ca',
   # 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.

third_party/libFuzzer/BUILD.gn

@@ -17,11 +17,6 @@ source_set("libfuzzer") {
     "src/FuzzerDataFlowTrace.cpp",
     "src/FuzzerDriver.cpp",
     "src/FuzzerExtFunctionsDlsym.cpp",
-
-    # Don't compile FuzzerExtFunctionsDlsymWin.cpp since it prevents use of
-    # LLVMFuzzerInitialize and LLVMFuzzerCustom* in non-component fuzzer builds
-    # on Windows and component fuzzer builds are not supported on Windows.
-    # See https://reviews.llvm.org/D51700 for more details.
     "src/FuzzerExtFunctionsWeak.cpp",
     "src/FuzzerExtFunctionsWeakAlias.cpp",
     "src/FuzzerExtraCounters.cpp",