Remove defunct enable_openmax variable from build/common.gypi.

Review URL: https://chromiumcodereview.appspot.com/23021011

git-svn-id: http://src.chromium.org/svn/trunk/src/build@218137 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -923,9 +923,6 @@
     # to ~/.gyp/include.gypi, gclient runhooks --force, and do a release build.
     'win_use_allocator_shim%': 1, # 1 = shim allocator via libcmt; 0 = msvcrt
 
-    # Whether usage of OpenMAX is enabled.
-    'enable_openmax%': 0,
-
     # Whether proprietary audio/video codecs are assumed to be included with
     # this build (only meaningful if branding!=Chrome).
     'proprietary_codecs%': 0,