Merge Tweaks Originating in Merge Review Comments

This merges several small changes that were made in response to
comments that arose when LMP changes were merged into the Widevine
repository's master branch.

Change-Id: Ifec968af54dbc3288f24654ec0c6ca9b5962e1aa

libwvdrmengine/cdm/core/include/string_conversions.h

@@ -22,7 +22,7 @@ std::string HexEncode(const uint8_t* bytes, unsigned size);
 std::string IntToString(int value);
 std::string UintToString(unsigned int value);
 int64_t htonll64(int64_t x);
-int64_t ntohll64(int64_t x);
+inline int64_t ntohll64(int64_t x) { return htonll64(x); }
 
 }  // namespace wvcdm