Remove stl_util's deletion function use from blimp/.

blimp/client/app/blimp_discardable_memory_allocator.cc

Index: blimp/client/app/blimp_discardable_memory_allocator.cc
diff --git a/blimp/client/app/blimp_discardable_memory_allocator.cc b/blimp/client/app/blimp_discardable_memory_allocator.cc
index 1b06143559dcb4ca3a73a58c9c2634344e8b70e5..d11982206745f40caeb0e4e178e148ba9445e324 100644
--- a/blimp/client/app/blimp_discardable_memory_allocator.cc
+++ b/blimp/client/app/blimp_discardable_memory_allocator.cc
@@ -6,7 +6,6 @@
 
 #include "base/macros.h"
 #include "base/memory/discardable_memory.h"
-#include "base/stl_util.h"
 #include "base/trace_event/memory_allocator_dump.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "base/trace_event/process_memory_dump.h"
@@ -117,7 +116,7 @@ BlimpDiscardableMemoryAllocator::BlimpDiscardableMemoryAllocator(
 
 BlimpDiscardableMemoryAllocator::~BlimpDiscardableMemoryAllocator() {
   DCHECK_EQ(0, locked_chunks_);
-  base::STLDeleteElements(&live_unlocked_chunks_);
+  DCHECK_EQ(0u, live_unlocked_chunks_.size());
 }
 
 std::unique_ptr<base::DiscardableMemory>