[heap profiler] Do not try to pass collected profile if no callback is set.

This is a quickfix for a crash when a heap profile is being reported
over UMA on Android.

BUG=973430

Change-Id: I07cf28ef18809ab82c1a447f686871f6bedb71fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1659025
Commit-Queue: Alexei Filippov <alph@chromium.org>
Auto-Submit: Alexei Filippov <alph@chromium.org>
Reviewed-by: Mike Wittman <wittman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#669098}

components/metrics/call_stack_profile_builder.cc

@@ -17,6 +17,7 @@
 #include "base/metrics/metrics_hashes.h"
 #include "base/no_destructor.h"
 #include "base/stl_util.h"
+#include "build/build_config.h"
 #include "components/metrics/call_stack_profile_encoding.h"
 
 namespace metrics {
@@ -250,8 +251,12 @@ void CallStackProfileBuilder::SetParentProfileCollectorForChildProcess(
 void CallStackProfileBuilder::PassProfilesToMetricsProvider(
     SampledProfile sampled_profile) {
   if (sampled_profile.process() == BROWSER_PROCESS) {
+    // TODO(crbug.com/973430): Remove the check once profile reporting on
+    // Android is sorted out.
+#if !defined(OS_ANDROID)
     GetBrowserProcessReceiverCallbackInstance().Run(profile_start_time_,
                                                     std::move(sampled_profile));
+#endif
   } else {
     g_child_call_stack_profile_collector.Get()
         .ChildCallStackProfileCollector::Collect(profile_start_time_,