Revert of Change memory dumps to not use periodic dumps by default.

base/trace_event/trace_config.cc

Index: base/trace_event/trace_config.cc
diff --git a/base/trace_event/trace_config.cc b/base/trace_event/trace_config.cc
index e2e7b8f39fc6bfe6b2987899380625695617f3de..b6fefa96aafd33dab84d41d09e876bd8afba485a 100644
--- a/base/trace_event/trace_config.cc
+++ b/base/trace_event/trace_config.cc
@@ -50,6 +50,11 @@
 const char kEventFiltersParam[] = "event_filters";
 const char kFilterPredicateParam[] = "filter_predicate";
 const char kFilterArgsParam[] = "filter_args";
+
+// Default configuration of memory dumps.
+const TraceConfig::MemoryDumpConfig::Trigger kDefaultMemoryDumpTrigger = {
+    5000,  // min_time_between_dumps_ms
+    MemoryDumpLevelOfDetail::DETAILED, MemoryDumpType::PERIODIC_INTERVAL};
 
 class ConvertableTraceConfigToTraceFormat
     : public base::trace_event::ConvertableToTraceFormat {
@@ -454,6 +459,7 @@
 
 void TraceConfig::SetDefaultMemoryDumpConfig() {
   memory_dump_config_.Clear();
+  memory_dump_config_.triggers.push_back(kDefaultMemoryDumpTrigger);
   memory_dump_config_.allowed_dump_modes = GetDefaultAllowedMemoryDumpModes();
 }