[sensors] [mac] Implement ambient light sensor for macOS

device/generic_sensor/one_writer_seqlock.h

Index: device/generic_sensor/one_writer_seqlock.h
diff --git a/content/common/one_writer_seqlock.h b/device/generic_sensor/one_writer_seqlock.h
similarity index 90%
rename from content/common/one_writer_seqlock.h
rename to device/generic_sensor/one_writer_seqlock.h
index e301e848d5c86c5920b354e7539ef393a1b88050..51523a3cea5764c570ccb1345ea0a7b6a3477de9 100644
--- a/content/common/one_writer_seqlock.h
+++ b/device/generic_sensor/one_writer_seqlock.h
@@ -8,9 +8,8 @@
 #include "base/atomicops.h"
 #include "base/macros.h"
 #include "base/threading/platform_thread.h"
-#include "content/common/content_export.h"
 
-namespace content {
+namespace device {
 
 // This SeqLock handles only *one* writer and multiple readers. It may be
 // suitable for low-contention with relatively infrequent writes, and many
@@ -29,7 +28,7 @@ namespace content {
 // garbage, or indices could be out of range. Probably the only suitable thing
 // to do during the read loop is to make a copy of the data, and operate on it
 // only after the read was found to be consistent.
-class CONTENT_EXPORT OneWriterSeqLock {
+class OneWriterSeqLock {
  public:
   OneWriterSeqLock();
   base::subtle::Atomic32 ReadBegin();
@@ -42,6 +41,6 @@ class CONTENT_EXPORT OneWriterSeqLock {
   DISALLOW_COPY_AND_ASSIGN(OneWriterSeqLock);
 };
 
-}  // namespace content
+}  // namespace device
 
-#endif  // CONTENT_COMMON_ONE_WRITER_SEQLOCK_H_
+#endif  // DEVICE_GENERIC_SENSOR_ONE_WRITER_SEQLOCK_H_