Revert properties_source_file change.

We broke the Chromecast build with our recent Roku changes.

Cherry-picked from upstream.

Change-Id: I7838d10b2ad0ef8b93d8b8510e96e7d4cfa2596a

README.upgrading

@@ -12,9 +12,6 @@ You may override these defaults in your platform-specific gypi.
 New in v2.1.4:
 =====
 New gyp variables have been introduced to make the build more configurable:
-  * properties_source_file
-    Allows the file cdm/src/properties_common.cpp to be replaced with a
-    platform-specific version.
   * protobuf_gyp
     For gyp-based projects with their own internal version of protobuf, allows
     the path to the protobuf gyp file to be overridden.  The default is

cdm/cdm.gyp

@@ -39,8 +39,8 @@
         '../third_party/stringencoders/src',
       ],
       'sources': [
-        '<(properties_source_file)',
         '../cdm/src/file_store.cpp',
+        '../cdm/src/properties_common.cpp',
         '../core/src/string_conversions.cpp',
         '../linux/src/lock.cpp',
         '../linux/src/log.cpp',

platforms/global_config.gypi

@@ -18,7 +18,6 @@
     'certificate_provision%': 'false',
     'force_use_of_secure_buffers%': 'false',
     'disable_privacy_crypto%': 'false',
-    'properties_source_file%': 'src/properties_common.cpp',
     'protobuf_gyp%': '<(DEPTH)/third_party/protobuf.gyp',
   }, # end variables