Revert of tracing: add dump provider for malloc heap profiler

base/trace_event/heap_profiler_allocation_context_tracker_unittest.cc

Index: base/trace_event/heap_profiler_allocation_context_tracker_unittest.cc
diff --git a/base/trace_event/heap_profiler_allocation_context_tracker_unittest.cc b/base/trace_event/heap_profiler_allocation_context_tracker_unittest.cc
index 2498fcd30c913463c3899e8b075481bd60148dbc..58255ad788ae3d4538db0dd97931c27d17877470 100644
--- a/base/trace_event/heap_profiler_allocation_context_tracker_unittest.cc
+++ b/base/trace_event/heap_profiler_allocation_context_tracker_unittest.cc
@@ -27,9 +27,7 @@
 // in |AllocationContextTracker::GetContextSnapshot|.
 template <size_t N>
 void AssertBacktraceEquals(const StackFrame(&expected_backtrace)[N]) {
-  AllocationContext ctx =
-      AllocationContextTracker::GetInstanceForCurrentThread()
-          ->GetContextSnapshot();
+  AllocationContext ctx = AllocationContextTracker::GetContextSnapshot();
 
   auto actual = std::begin(ctx.backtrace.frames);
   auto actual_bottom = std::end(ctx.backtrace.frames);
@@ -48,9 +46,7 @@
 }
 
 void AssertBacktraceEmpty() {
-  AllocationContext ctx =
-      AllocationContextTracker::GetInstanceForCurrentThread()
-          ->GetContextSnapshot();
+  AllocationContext ctx = AllocationContextTracker::GetContextSnapshot();
 
   for (StackFrame frame : ctx.backtrace.frames)
     ASSERT_EQ(nullptr, frame);
@@ -211,9 +207,7 @@
 
   {
     TRACE_EVENT0("Testing", kGingerbread);
-    AllocationContext ctx =
-        AllocationContextTracker::GetInstanceForCurrentThread()
-            ->GetContextSnapshot();
+    AllocationContext ctx = AllocationContextTracker::GetContextSnapshot();
 
     // The pseudo stack relies on pointer equality, not deep string comparisons.
     ASSERT_EQ(kCupcake, ctx.backtrace.frames[0]);
@@ -221,9 +215,7 @@
   }
 
   {
-    AllocationContext ctx =
-        AllocationContextTracker::GetInstanceForCurrentThread()
-            ->GetContextSnapshot();
+    AllocationContext ctx = AllocationContextTracker::GetContextSnapshot();
     ASSERT_EQ(kCupcake, ctx.backtrace.frames[0]);
     ASSERT_EQ(kFroyo, ctx.backtrace.frames[11]);
   }