libchrome: Several upstreamable fixes from libchrome

base/metrics/persistent_histogram_allocator.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/metrics/persistent_histogram_allocator.h"
 
 #include <memory>
 
 #include "base/files/important_file_writer.h"
 #include "base/lazy_instance.h"
@@ skipping 606 matching lines @@
     uint64_t id,
     StringPiece name) {
   Set(WrapUnique(new GlobalHistogramAllocator(
       WrapUnique(new LocalPersistentMemoryAllocator(size, id, name)))));
 }
 
 // static
 void GlobalHistogramAllocator::CreateWithSharedMemory(
     std::unique_ptr<SharedMemory> memory,
     size_t size,
-    uint64_t id,
-    StringPiece name) {
+    uint64_t /*id*/,
+    StringPiece /*name*/) {
   if ((!memory->memory() && !memory->Map(size)) ||
       !SharedPersistentMemoryAllocator::IsSharedMemoryAcceptable(*memory)) {
     NOTREACHED();
     return;
   }
 
   DCHECK_LE(memory->mapped_size(), size);
   Set(WrapUnique(new GlobalHistogramAllocator(
       WrapUnique(new SharedPersistentMemoryAllocator(
           std::move(memory), 0, StringPiece(), /*readonly=*/false)))));
@@ skipping 119 matching lines @@
   while (true) {
     std::unique_ptr<HistogramBase> histogram =
         import_iterator_.GetNextWithIgnore(record_to_ignore);
     if (!histogram)
       break;
     StatisticsRecorder::RegisterOrDeleteDuplicate(histogram.release());
   }
 }
 
 }  // namespace base