Build supported media targets on iOS.

Makes the changes required to get media and media_unittests to build
successfully for iOS, building only the limited set of files that iOS requires.

BUG=None


Review URL: https://chromiumcodereview.appspot.com/10919092

git-svn-id: http://src.chromium.org/svn/trunk/src/build@154996 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

all.gyp

@@ -12,6 +12,7 @@
         'some.gyp:*',
         '../base/base.gyp:*',
         '../crypto/crypto.gyp:*',
+        '../media/media.gyp:*',
         '../net/net.gyp:*',
         '../sql/sql.gyp:*',
         '../testing/gtest.gyp:*',
@@ -38,7 +39,6 @@
             '../gpu/tools/tools.gyp:*',
             '../ipc/ipc.gyp:*',
             '../jingle/jingle.gyp:*',
-            '../media/media.gyp:*',
             '../ppapi/ppapi.gyp:*',
             '../ppapi/ppapi_internal.gyp:*',
             '../printing/printing.gyp:*',