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

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index 8c73a6e475ec2ccb4b97d9d736cdc036d38eca24..d5b815d207a85f98da84aba2243da59f3c8291c7 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -842,8 +842,11 @@
     "trace_event/process_memory_dump.h",
     "trace_event/process_memory_maps.cc",
     "trace_event/process_memory_maps.h",
+    "trace_event/process_memory_maps_dump_provider.h",
     "trace_event/process_memory_totals.cc",
     "trace_event/process_memory_totals.h",
+    "trace_event/process_memory_totals_dump_provider.cc",
+    "trace_event/process_memory_totals_dump_provider.h",
     "trace_event/trace_buffer.cc",
     "trace_event/trace_buffer.h",
     "trace_event/trace_config.cc",
@@ -984,6 +987,7 @@
       "sys_info_linux.cc",
       "trace_event/malloc_dump_provider.cc",
       "trace_event/malloc_dump_provider.h",
+      "trace_event/process_memory_maps_dump_provider.cc",
     ]
     set_sources_assignment_filter(sources_assignment_filter)
 
@@ -1050,6 +1054,7 @@
       "sync_socket_posix.cc",
       "sys_info.cc",
       "sys_info_posix.cc",
+      "trace_event/process_memory_totals_dump_provider.cc",
       "trace_event/trace_event_system_stats_monitor.cc",
     ]
 
@@ -1178,6 +1183,7 @@
     sources += [
       "trace_event/malloc_dump_provider.cc",
       "trace_event/malloc_dump_provider.h",
+      "trace_event/process_memory_maps_dump_provider.cc",
     ]
 
     if (is_asan || is_lsan || is_msan || is_tsan) {
@@ -1814,6 +1820,7 @@
     "trace_event/memory_allocator_dump_unittest.cc",
     "trace_event/memory_dump_manager_unittest.cc",
     "trace_event/process_memory_dump_unittest.cc",
+    "trace_event/process_memory_totals_dump_provider_unittest.cc",
     "trace_event/trace_config_memory_test_util.h",
     "trace_event/trace_config_unittest.cc",
     "trace_event/trace_event_argument_unittest.cc",
@@ -1928,6 +1935,10 @@
     }
   }
 
+  if (is_linux || is_android) {
+    sources += [ "trace_event/process_memory_maps_dump_provider_unittest.cc" ]
+  }
+
   if (!is_linux || use_ozone) {
     sources -= [ "message_loop/message_pump_glib_unittest.cc" ]
   }