Disable a v8_unwinder unit test

The stack sampler is broken for now on Arm Macs, so disable a failing
v8_unwinder unit test too.

Bug: 1102197, 1128464
Change-Id: Ie0091eb8efc7a96d4f917ed394585e1b6595c7d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2413023Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807325}

chrome/renderer/v8_unwinder_unittest.cc

@@ -435,8 +435,9 @@ TEST(V8UnwinderTest, CanUnwindFrom_NullModule) {
 }
 
 // Checks that unwinding from C++ through JavaScript and back into C++ succeeds.
-// NB: unwinding is only supported for 64 bit Windows and OS X.
-#if (defined(OS_WIN) && defined(ARCH_CPU_64_BITS)) || defined(OS_MAC)
+// NB: unwinding is only supported for 64 bit Windows and Intel macOS.
+#if (defined(OS_WIN) && defined(ARCH_CPU_64_BITS)) || \
+    (defined(OS_MAC) && defined(ARCH_CPU_X86_64))
 #define MAYBE_UnwindThroughV8Frames UnwindThroughV8Frames
 #else
 #define MAYBE_UnwindThroughV8Frames DISABLED_UnwindThroughV8Frames