Remove calls to IsRunningSequenceOnCurrentThread() in wallpaper API.

components/wallpaper/wallpaper_manager_base.cc

Index: components/wallpaper/wallpaper_manager_base.cc
diff --git a/components/wallpaper/wallpaper_manager_base.cc b/components/wallpaper/wallpaper_manager_base.cc
index a29a4b36365458ceb80982075c66a9cc8ee43295..e0d38e34ad41ab8e692ff6cb46cf6b7e69bc2c41 100644
--- a/components/wallpaper/wallpaper_manager_base.cc
+++ b/components/wallpaper/wallpaper_manager_base.cc
@@ -10,6 +10,7 @@
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
+#include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/path_service.h"
@@ -63,6 +64,11 @@ const unsigned kLoadMaxDelayMs = 2000;
 // color.
 const SkColor kDefaultWallpaperColor = SK_ColorGRAY;
 
+#if DCHECK_IS_ON()
+base::LazyInstance<base::SequenceChecker>::Leaky g_wallpaper_sequence_checker =
+    LAZY_INSTANCE_INITIALIZER;
+#endif
+
 // The path ids for directories.
 int dir_user_data_path_id = -1;            // chrome::DIR_USER_DATA
 int dir_chromeos_wallpapers_path_id = -1;  // chrome::DIR_CHROMEOS_WALLPAPERS
@@ -158,6 +164,12 @@ WallpaperInfo::WallpaperInfo(const std::string& in_location,
 WallpaperInfo::~WallpaperInfo() {
 }
 
+void AssertCalledOnWallpaperSequence() {
+#if DCHECK_IS_ON()
+  DCHECK(g_wallpaper_sequence_checker.Get().CalledOnValidSequence());
+#endif
+}
+
 const char kWallpaperSequenceTokenName[] = "wallpaper-sequence";
 
 const char kSmallWallpaperSuffix[] = "_small";