Remove use of deprecated MessageLoop methods in sql.

sql/connection.cc

Index: sql/connection.cc
diff --git a/sql/connection.cc b/sql/connection.cc
index f4da99ef76b4c3048eec6b4c2798803f775bbb59..cab1cbf806d5db1ebac9b7d30bd708a80ac96908 100644
--- a/sql/connection.cc
+++ b/sql/connection.cc
@@ -18,15 +18,18 @@
 #include "base/format_macros.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/lazy_instance.h"
+#include "base/location.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
+#include "base/single_thread_task_runner.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/synchronization/lock.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "sql/connection_memory_dump_provider.h"
 #include "sql/meta_table.h"
@@ -161,16 +164,16 @@ void InitializeSqlite() {
     // Schedule callback to record memory footprint histograms at 10m, 1h, and
     // 1d.  There may not be a message loop in tests.
     if (base::MessageLoop::current()) {

[Scott Hess - ex-Googler, 2016/06/06 22:10:46]

Is this test supported in the new world?  It's probably why message_loop.h is
still necessary.  Should it test the Get() statement below?  If changed, the
comment language should probably change.

[fdoray, 2016/06/07 00:00:00]

Done.

Other uses of "if (base::MessageLoop::current())" in the code base will be
removed by a separate mass migration.

-      base::MessageLoop::current()->PostDelayedTask(
+      base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
           FROM_HERE, base::Bind(&RecordSqliteMemory10Min),
           base::TimeDelta::FromMinutes(10));
-      base::MessageLoop::current()->PostDelayedTask(
+      base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
           FROM_HERE, base::Bind(&RecordSqliteMemoryHour),
           base::TimeDelta::FromHours(1));
-      base::MessageLoop::current()->PostDelayedTask(
+      base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
           FROM_HERE, base::Bind(&RecordSqliteMemoryDay),
           base::TimeDelta::FromDays(1));
-      base::MessageLoop::current()->PostDelayedTask(
+      base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
           FROM_HERE, base::Bind(&RecordSqliteMemoryWeek),
           base::TimeDelta::FromDays(7));
     }