NOCOMMIT: Rebased https://codereview.chromium.org/2696503004 on service rename

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 246a5aadcafddcd92ca15c4e96e871fc5763905c..a74db3c2f4cbdba096579b91948c83bf487cd36d 100644
--- a/base/trace_event/memory_dump_manager.cc
+++ b/base/trace_event/memory_dump_manager.cc
@@ -152,9 +152,7 @@ void MemoryDumpManager::SetInstanceForTesting(MemoryDumpManager* instance) {
 }
 
 MemoryDumpManager::MemoryDumpManager()
-    : delegate_(nullptr),
-      is_coordinator_(false),
-      memory_tracing_enabled_(0),
+    : memory_tracing_enabled_(0),
       tracing_process_id_(kInvalidTracingProcessId),
       dumper_registrations_ignored_for_testing_(false),
       heap_profiling_enabled_(false) {
@@ -209,14 +207,13 @@ void MemoryDumpManager::EnableHeapProfilingIfNeeded() {
   heap_profiling_enabled_ = true;
 }
 
-void MemoryDumpManager::Initialize(MemoryDumpManagerDelegate* delegate,
-                                   bool is_coordinator) {
+void MemoryDumpManager::Initialize(
+    std::unique_ptr<MemoryDumpManagerDelegate> delegate) {
   {
     AutoLock lock(lock_);
     DCHECK(delegate);
     DCHECK(!delegate_);
-    delegate_ = delegate;
-    is_coordinator_ = is_coordinator;
+    delegate_.swap(delegate);
     EnableHeapProfilingIfNeeded();
   }
 
@@ -447,21 +444,10 @@ void MemoryDumpManager::RequestGlobalDump(
                                     TRACE_ID_MANGLE(guid));
   MemoryDumpCallback wrapped_callback = Bind(&OnGlobalDumpDone, callback);
 
-  // Technically there is no need to grab the |lock_| here as the delegate is
-  // long-lived and can only be set by Initialize(), which is locked and
-  // necessarily happens before memory_tracing_enabled_ == true.
-  // Not taking the |lock_|, though, is lakely make TSan barf and, at this point
-  // (memory-infra is enabled) we're not in the fast-path anymore.
-  MemoryDumpManagerDelegate* delegate;
-  {
-    AutoLock lock(lock_);
-    delegate = delegate_;
-  }
-
   // The delegate will coordinate the IPC broadcast and at some point invoke
   // CreateProcessDump() to get a dump for the current process.
   MemoryDumpRequestArgs args = {guid, dump_type, level_of_detail};
-  delegate->RequestGlobalMemoryDump(args, wrapped_callback);
+  delegate_->RequestGlobalMemoryDump(args, wrapped_callback);
 }
 
 void MemoryDumpManager::RequestGlobalDump(
@@ -807,7 +793,7 @@ void MemoryDumpManager::OnTraceLogEnabled() {
 
     subtle::NoBarrier_Store(&memory_tracing_enabled_, 1);
 
-    if (!is_coordinator_)
+    if (!delegate_->IsCoordinator())
       return;
   }