Revert of [tracing] Add native allocation tracing mode.

base/trace_event/memory_dump_manager.cc

Index: base/trace_event/memory_dump_manager.cc
diff --git a/base/trace_event/memory_dump_manager.cc b/base/trace_event/memory_dump_manager.cc
index 4ff8d5da9a15227e2dcecac14836530c249090ed..5ae7460e2f78fbeb530f8b5e659e0e9cd2baf7da 100644
--- a/base/trace_event/memory_dump_manager.cc
+++ b/base/trace_event/memory_dump_manager.cc
@@ -170,26 +170,7 @@
           switches::kEnableHeapProfiling))
     return;
 
-  std::string profiling_mode = CommandLine::ForCurrentProcess()
-      ->GetSwitchValueASCII(switches::kEnableHeapProfiling);
-  if (profiling_mode == "") {
-    AllocationContextTracker::SetCaptureMode(
-        AllocationContextTracker::CaptureMode::PSEUDO_STACK);
-  }
-  else if (profiling_mode == switches::kEnableHeapProfilingModeNative) {
-#if ENABLE_NATIVE_ALLOCATION_TRACES
-    AllocationContextTracker::SetCaptureMode(
-        AllocationContextTracker::CaptureMode::NATIVE_STACK);
-#else
-    CHECK(false) << "'" << profiling_mode << "' mode for "
-                 << switches::kEnableHeapProfiling << " flag is not supported "
-                 << "for this platform / build type.";
-#endif
-  } else {
-    CHECK(false) << "Invalid mode '" << profiling_mode << "' for "
-               << switches::kEnableHeapProfiling << " flag.";
-  }
-
+  AllocationContextTracker::SetCaptureEnabled(true);
   for (auto mdp : dump_providers_)
     mdp->dump_provider->OnHeapProfilingEnabled(true);
   heap_profiling_enabled_ = true;