ART: Clean up ATRACE use

Remove old ATRACE_BEGIN & _END pairs, where possible. Remove
ATRACE_CALL and replace it with ScopedTrace.

Remove utils/Trace.h include.

Test: m
Change-Id: I3a5123202f4e373074bfe0f7359ee6c60a70352a
diff --git a/runtime/gc/heap.cc b/runtime/gc/heap.cc
index 91f1ff6..f7be4c8 100644
--- a/runtime/gc/heap.cc
+++ b/runtime/gc/heap.cc
@@ -800,12 +800,11 @@
   bool has_waited = false;
   uint64_t wait_start = NanoTime();
   if (thread_flip_running_) {
-    ATRACE_BEGIN("IncrementDisableThreadFlip");
+    ScopedTrace trace("IncrementDisableThreadFlip");
     while (thread_flip_running_) {
       has_waited = true;
       thread_flip_cond_->Wait(self);
     }
-    ATRACE_END();
   }
   ++disable_thread_flip_count_;
   if (has_waited) {