CacheStorage: Replace more thread API usage.

Bug: 960012
Change-Id: I4276b1bd22d418281d21b2034166cb094040dc14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1653248Reviewed-by: Staphany Park <staphany@chromium.org>
Commit-Queue: Ben Kelly <wanderview@chromium.org>
Cr-Commit-Position: refs/heads/master@{#669061}

content/browser/cache_storage/legacy/legacy_cache_storage.cc

@@ -23,11 +23,10 @@
 #include "base/metrics/histogram_macros.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/sequenced_task_runner.h"
-#include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
-#include "base/threading/thread_task_runner_handle.h"
+#include "base/threading/sequenced_task_runner_handle.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/traced_value.h"
 #include "content/browser/cache_storage/cache_storage.pb.h"
@@ -40,7 +39,6 @@
 #include "content/browser/cache_storage/cache_storage_trace_utils.h"
 #include "content/browser/cache_storage/legacy/legacy_cache_storage_manager.h"
 #include "content/common/background_fetch/background_fetch_types.h"
-#include "content/public/browser/browser_thread.h"
 #include "crypto/symmetric_key.h"
 #include "net/base/directory_lister.h"
 #include "net/base/net_errors.h"
@@ -66,7 +64,7 @@ std::string HexedHash(const std::string& value) {
 
 void SizeRetrievedFromAllCaches(std::unique_ptr<int64_t> accumulator,
                                 LegacyCacheStorage::SizeCallback callback) {
-  base::ThreadTaskRunnerHandle::Get()->PostTask(
+  base::SequencedTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::BindOnce(std::move(callback), *accumulator));
 }
 
@@ -795,7 +793,7 @@ void LegacyCacheStorage::ScheduleWriteIndex() {
   index_write_task_.Reset(base::BindOnce(&LegacyCacheStorage::WriteIndex,
                                          weak_factory_.GetWeakPtr(),
                                          base::DoNothing::Once<bool>()));
-  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
+  base::SequencedTaskRunnerHandle::Get()->PostDelayedTask(
       FROM_HERE, index_write_task_.callback(),
       base::TimeDelta::FromSeconds(kWriteIndexDelaySecs));
 }
@@ -1032,7 +1030,7 @@ void LegacyCacheStorage::DoomCacheImpl(const std::string& cache_name,
                          "cache_name", cache_name);
   CacheStorageCacheHandle cache_handle = GetLoadedCache(cache_name);
   if (!cache_handle.value()) {
-    base::ThreadTaskRunnerHandle::Get()->PostTask(
+    base::SequencedTaskRunnerHandle::Get()->PostTask(
         FROM_HERE,
         base::BindOnce(std::move(callback), CacheStorageError::kErrorNotFound));
     return;
@@ -1336,7 +1334,7 @@ void LegacyCacheStorage::SizeImpl(SizeCallback callback) {
   DCHECK(initialized_);
 
   if (cache_index_->GetPaddedStorageSize() != kSizeUnknown) {
-    base::ThreadTaskRunnerHandle::Get()->PostTask(
+    base::SequencedTaskRunnerHandle::Get()->PostTask(
         FROM_HERE, base::BindOnce(std::move(callback),
                                   cache_index_->GetPaddedStorageSize()));
     return;