base/allocator: Disable cronet BufferTest when USE_PARTITION_ALLOC_AS_MALLOC

Disables an unittest that tests OOM allocation behaviors when
USE_PARTITION_ALLOC_AS_MALLOC because PartitionAlloc-based
malloc() does not return nullptr and crash instead.

Bug: 998048
Change-Id: I8173667512c9041fb68a4cb441ddf11766f2dbdf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2374925Reviewed-by: Benoit L <lizeb@chromium.org>
Reviewed-by: Paul Jensen <pauljensen@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803153}

components/cronet/native/test/BUILD.gn

@@ -31,6 +31,7 @@ source_set("cronet_native_tests") {
   deps = [
     ":cronet_native_testutil",
     "//base",
+    "//base/allocator:buildflags",
     "//base/test:test_support",
     "//components/cronet/native:cronet_native_headers",
     "//components/cronet/test:test_support",

components/cronet/native/test/buffer_test.cc

@@ -6,6 +6,7 @@
 
 #include <limits>
 
+#include "base/allocator/buildflags.h"
 #include "base/check.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
@@ -74,10 +75,11 @@ TEST_F(BufferTest, TestInitWithAlloc) {
 }
 
 #if defined(ADDRESS_SANITIZER) || defined(MEMORY_SANITIZER) || \
-    defined(THREAD_SANITIZER) || defined(OS_FUCHSIA)
+    defined(THREAD_SANITIZER) || defined(OS_FUCHSIA) ||        \
+    BUILDFLAG(USE_PARTITION_ALLOC_AS_MALLOC)
 // ASAN and MSAN malloc by default triggers crash instead of returning null on
 // failure. Fuchsia malloc() also crashes on allocation failure in some kernel
-// builds.
+// builds. PartitionAlloc malloc also crashes on allocation failure by design.
 #define MAYBE_TestInitWithHugeAllocFails DISABLED_TestInitWithHugeAllocFails
 #else
 #define MAYBE_TestInitWithHugeAllocFails TestInitWithHugeAllocFails