tcmalloc: Honor HEAPPROFILE envvar only in profiling=1 builds.

third_party/tcmalloc/chromium/src/heap-profiler.cc

Index: third_party/tcmalloc/chromium/src/heap-profiler.cc
diff --git a/third_party/tcmalloc/chromium/src/heap-profiler.cc b/third_party/tcmalloc/chromium/src/heap-profiler.cc
index da4ed49bea7cc701bd4857d60710395ecac64861..46a81a499037487b69315b80c0105840a2eac1fa 100644
--- a/third_party/tcmalloc/chromium/src/heap-profiler.cc
+++ b/third_party/tcmalloc/chromium/src/heap-profiler.cc
@@ -662,7 +662,7 @@ extern "C" void HeapProfilerDumpAliveObjects(const char* filename) {
 //----------------------------------------------------------------------
 // Initialization/finalization code
 //----------------------------------------------------------------------
-
+#if defined(ENABLE_PROFILING)
 // Initialization code
 static void HeapProfilerInit() {
   // Everything after this point is for setting up the profiler based on envvar
@@ -693,3 +693,4 @@ struct HeapProfileEndWriter {
 static const TCMallocGuard tcmalloc_initializer;
 REGISTER_MODULE_INITIALIZER(heapprofiler, HeapProfilerInit());
 static HeapProfileEndWriter heap_profile_end_writer;
+#endif   // defined(ENABLE_PROFILING)