Convert //base to use std::unique_ptr

base/trace_event/malloc_dump_provider.cc

Index: base/trace_event/malloc_dump_provider.cc
diff --git a/base/trace_event/malloc_dump_provider.cc b/base/trace_event/malloc_dump_provider.cc
index d8f82edfed52090195560dc1aa1dde2b656160f8..17e5c1e62074f95720442ee3b49a944607b490bf 100644
--- a/base/trace_event/malloc_dump_provider.cc
+++ b/base/trace_event/malloc_dump_provider.cc
@@ -191,7 +191,7 @@ bool MallocDumpProvider::OnMemoryDump(const MemoryDumpArgs& args,
     }  // lock(allocation_register_lock_)
 
     if (!bytes_by_context.empty()) {
-      scoped_ptr<TracedValue> heap_dump = ExportHeapDump(
+      std::unique_ptr<TracedValue> heap_dump = ExportHeapDump(
           bytes_by_context, pmd->session_state()->stack_frame_deduplicator(),
           pmd->session_state()->type_name_deduplicator());
       pmd->AddHeapDump("malloc", std::move(heap_dump));