arcvm: Reduce fuzzer input size limit to 64KB

Bug: 1153405
Change-Id: I076eb7e4868a9671553426a0a247116fd20bb54d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2583102
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Auto-Submit: Jesse Schettler <jschettler@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835344}

components/arc/session/arc_property_util_expand_property_contents_fuzzer.cc

@@ -17,7 +17,7 @@
 #include "testing/libfuzzer/libfuzzer_exports.h"
 
 namespace {
-constexpr size_t kMaxInputSize = 256 * 1024;
+constexpr size_t kMaxInputSize = 64 * 1024;
 }
 
 extern "C" int LLVMFuzzerInitialize(int* argc, char*** argv) {