Clean comments, namespace, and variable names

This CL removes TODOs and email addresses from comments, unifies some
namespaces and cleans a few variable names.  It is a copy of multiple
CLs on the widevine side.

Change-Id: I1bb649096476a5001a56d746427399de6a88ff69

libwvdrmengine/cdm/core/include/clock.h

@@ -2,8 +2,8 @@
 //
 // Clock - Platform independent interface for a time library
 //
-#ifndef CDM_BASE_CLOCK_H_
-#define CDM_BASE_CLOCK_H_
+#ifndef WVCDM_CORE_CLOCK_H_
+#define WVCDM_CORE_CLOCK_H_
 
 #include <stdint.h>
 
@@ -22,4 +22,4 @@ class Clock {
 
 };  // namespace wvcdm
 
-#endif  // CDM_BASE_CLOCK_H_
+#endif  // WVCDM_CORE_CLOCK_H_