[base] Skip OutputToStream checks in Fuchsia Official builds.

StackTrace has a bug preventing it from capturing any stack frames in
Fuchsia Official builds, so disable those checks for now.

TBR=ajwong

Bug: 1025329, 1025288
Change-Id: I2b24c7f903c345518835edc3226b15355ea1bf9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1919735Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Auto-Submit: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715875}

base/debug/stack_trace_unittest.cc

@@ -56,6 +56,12 @@ TEST_F(StackTraceTest, OutputToStream) {
   return;
 #endif  // defined(OFFICIAL_BUILD) && defined(OS_POSIX) && !defined(OS_MACOSX)
 
+#if defined(OFFICIAL_BUILD) && defined(OS_FUCHSIA)
+  // TODO(https://crbug.com/1025329): StackTrace fails to capture any frames in
+  // Fuchsia Official builds.
+  return;
+#endif  // defined(OFFICIAL_BUILD) && defined(OS_FUCHSIA)
+
   ASSERT_TRUE(addresses);
   ASSERT_GT(frames_found, 5u) << "Too few frames found.";