Speculatively increase test timeouts under MSan.

base/test/test_timeouts.cc

Index: base/test/test_timeouts.cc
diff --git a/base/test/test_timeouts.cc b/base/test/test_timeouts.cc
index 34a0902765ca10d39698083b130a9f9bf7f40f4b..b491b993a03c6bfa39b667bafc3f167d0dca1d0e 100644
--- a/base/test/test_timeouts.cc
+++ b/base/test/test_timeouts.cc
@@ -16,8 +16,10 @@ namespace {
 
 // ASan/TSan/MSan instrument each memory access. This may slow the execution
 // down significantly.
-#if defined(ADDRESS_SANITIZER) || defined(THREAD_SANITIZER) || \
-    defined(SYZYASAN) || defined(MEMORY_SANITIZER)
+#if defined(MEMORY_SANITIZER)
+static const int kTimeoutMultiplier = 3;
+#elif defined(ADDRESS_SANITIZER) || defined(THREAD_SANITIZER) || \
+    defined(SYZYASAN)
 static const int kTimeoutMultiplier = 2;
 #else
 static const int kTimeoutMultiplier = 1;