[tracing] Turn StackFrame into struct.

base/trace_event/heap_profiler_allocation_register_unittest.cc

Index: base/trace_event/heap_profiler_allocation_register_unittest.cc
diff --git a/base/trace_event/heap_profiler_allocation_register_unittest.cc b/base/trace_event/heap_profiler_allocation_register_unittest.cc
index ceaff6e062fecf3165828350a7a415d11caf30a3..2d5129bc8a13a05bcde6c242b3f85dba48f56407 100644
--- a/base/trace_event/heap_profiler_allocation_register_unittest.cc
+++ b/base/trace_event/heap_profiler_allocation_register_unittest.cc
@@ -107,8 +107,10 @@ TEST_F(AllocationRegisterTest, DoubleInsertOverwrites) {
   // Find out the cause and ban double insert if possible.
   AllocationRegister reg;
   AllocationContext ctx = AllocationContext::Empty();
-  StackFrame frame1 = "Foo";
-  StackFrame frame2 = "Bar";
+  StackFrame frame1 = StackFrame::FromTraceEventName("Foo");
+  StackFrame frame2 = StackFrame::FromTraceEventName("Bar");
+
+  ctx.backtrace.frame_count = 1;
 
   ctx.backtrace.frames[0] = frame1;
   reg.Insert(reinterpret_cast<void*>(1), 11, ctx);