ChromeOS: Do not use TraceStackFramePointers() with MSAN.

chrome/browser/chromeos/libc_close_tracking.cc

Index: chrome/browser/chromeos/libc_close_tracking.cc
diff --git a/chrome/browser/chromeos/libc_close_tracking.cc b/chrome/browser/chromeos/libc_close_tracking.cc
index 5f77f0df827cf26037202b63997952eb9ad85c90..260a116b5a2e664ed3e7064d42af3ccc765f6882 100644
--- a/chrome/browser/chromeos/libc_close_tracking.cc
+++ b/chrome/browser/chromeos/libc_close_tracking.cc
@@ -119,9 +119,11 @@ int CloseOverride(int fd) {
 
   // Capture stack for successful close.
   if (ret == 0) {
-#if HAVE_TRACE_STACK_FRAME_POINTERS
+#if HAVE_TRACE_STACK_FRAME_POINTERS && !defined(MEMORY_SANITIZER)
     // Use TraceStackFramePointers because the backtrack() based default
     // capturing gets only the last stack frame and is not useful.
+    // With the exception of when MSAN is enabled. See comments for why
+    // StackTraceTest.TraceStackFramePointers is disabled in MSAN builds.
     const void* frames[64];
     const size_t frame_count =
         base::debug::TraceStackFramePointers(frames, arraysize(frames), 0);