Revert of [tracing] Dump child processes' memory metrics in browser

content/browser/tracing/tracing_controller_impl.cc

Index: content/browser/tracing/tracing_controller_impl.cc
diff --git a/content/browser/tracing/tracing_controller_impl.cc b/content/browser/tracing/tracing_controller_impl.cc
index 438f1269ac73d969e0727c43ab01f06e3c3b940c..684bea8ec49b574b7ce45586d9aee86388c0e645 100644
--- a/content/browser/tracing/tracing_controller_impl.cc
+++ b/content/browser/tracing/tracing_controller_impl.cc
@@ -12,7 +12,6 @@
 #include "base/sys_info.h"
 #include "base/trace_event/trace_event.h"
 #include "build/build_config.h"
-#include "components/tracing/process_metrics_memory_dump_provider.h"
 #include "content/browser/tracing/file_tracing_provider_impl.h"
 #include "content/browser/tracing/power_tracing_agent.h"
 #include "content/browser/tracing/trace_message_filter.h"
@@ -557,13 +556,6 @@
     return;
   }
 
-#if defined(OS_LINUX)
-  // On Linux the browser process dumps process metrics for child process due to
-  // sandbox.
-  tracing::ProcessMetricsMemoryDumpProvider::RegisterForProcess(
-      trace_message_filter->peer_pid());
-#endif
-
   trace_message_filters_.insert(trace_message_filter);
   if (can_cancel_watch_event()) {
     trace_message_filter->SendSetWatchEvent(watch_category_name_,
@@ -591,11 +583,6 @@
                    make_scoped_refptr(trace_message_filter)));
     return;
   }
-
-#if defined(OS_LINUX)
-  tracing::ProcessMetricsMemoryDumpProvider::UnregisterForProcess(
-      trace_message_filter->peer_pid());
-#endif
 
   // If a filter is removed while a response from that filter is pending then
   // simulate the response. Otherwise the response count will be wrong and the