Revert of [tracing] Adding task information to heap profiler

base/trace_event/heap_profiler_allocation_context_tracker.cc

Index: base/trace_event/heap_profiler_allocation_context_tracker.cc
diff --git a/base/trace_event/heap_profiler_allocation_context_tracker.cc b/base/trace_event/heap_profiler_allocation_context_tracker.cc
index 518792c4a5034b448eb364d13c3b223da147a4dd..0aa54a84ed380f8ee7e8f669bd78532041943e14 100644
--- a/base/trace_event/heap_profiler_allocation_context_tracker.cc
+++ b/base/trace_event/heap_profiler_allocation_context_tracker.cc
@@ -19,7 +19,6 @@
 namespace {
 
 const size_t kMaxStackDepth = 128u;
-const size_t kMaxTaskDepth = 16u;
 AllocationContextTracker* const kInitializingSentinel =
     reinterpret_cast<AllocationContextTracker*>(-1);
 
@@ -52,7 +51,6 @@
 
 AllocationContextTracker::AllocationContextTracker() : thread_name_(nullptr) {
   pseudo_stack_.reserve(kMaxStackDepth);
-  task_contexts_.reserve(kMaxTaskDepth);
 }
 AllocationContextTracker::~AllocationContextTracker() {}
 
@@ -101,20 +99,6 @@
   pseudo_stack_.pop_back();
 }
 
-void AllocationContextTracker::PushCurrentTaskContext(const char* context) {
-  DCHECK(context);
-  if (task_contexts_.size() < kMaxTaskDepth)
-    task_contexts_.push_back(context);
-  else
-    NOTREACHED();
-}
-
-void AllocationContextTracker::PopCurrentTaskContext(const char* context) {
-  DCHECK_EQ(context, task_contexts_.back())
-      << "Encountered an unmatched context end";
-  task_contexts_.pop_back();
-}
-
 // static
 AllocationContext AllocationContextTracker::GetContextSnapshot() {
   AllocationContext ctx;
@@ -141,9 +125,7 @@
     std::fill(dst, dst_end, nullptr);
   }
 
-  // TODO(ssid): Fix crbug.com/594803 to add file name as 3rd dimension
-  // (component name) in the heap profiler and not piggy back on the type name.
-  ctx.type_name = task_contexts_.empty() ? nullptr : task_contexts_.back();
+  ctx.type_name = nullptr;
 
   return ctx;
 }