Remove non-ASCII curly quotes from OEMCryptoCENC.h

Merge from Widevine repo of http://go/wvgerrit/131305

The OPK tools are choking on non-ASCII characters when running on the
fuzz bots. This patch removes the problem characters from the header.
This brings these curly quotes in-line with the rest of the quotes in
the header.

Bug: 192275441
Change-Id: I9ba57abcd1275663601efc2a9170d7ab6aa4b4b8

libwvdrmengine/oemcrypto/include/OEMCryptoCENC.h

@@ -57,7 +57,7 @@
  * a root of trust to secure content on a device that uses Provisioning
  * 3.0. Factory Provisioning a device is related to manufacturing methods. This
  * section describes the API that installs the Widevine Keybox and the
- * recommended methods for the OEM’s factory provisioning procedure.
+ * recommended methods for the OEM's factory provisioning procedure.
  *
  * Starting with API version 10, devices should have two keyboxes.  One is the
  * production keybox which may be installed in the factory, or using
@@ -69,7 +69,7 @@
  * OEMCrypto_Terminate has been called, the production keybox should be active
  * again.
  *
- * API functions marked as optional may be used by the OEM’s factory
+ * API functions marked as optional may be used by the OEM's factory
  * provisioning procedure and implemented in the library, but are not called
  * from the Widevine DRM Plugin during normal operation.
  *
@@ -90,7 +90,7 @@
  * functions in this section are for devices that are provisioned with an OEM
  * Certificate, i.e. Provisioning 3.0.
  *
- * API functions marked as optional may be used by the OEM’s factory
+ * API functions marked as optional may be used by the OEM's factory
  * provisioning procedure and implemented in the library, but are not called
  * from the Widevine DRM Plugin during normal operation.
  *