Remove deadline

BUG=aomedia:13

Change-Id: I9df343f4a6a809b09446ff1f2083c38771ab068b
diff --git a/usage_cx.dox b/usage_cx.dox
index dcf267c..51b4e8e 100644
--- a/usage_cx.dox
+++ b/usage_cx.dox
@@ -2,11 +2,7 @@
 
     The aom_codec_encode() function is at the core of the encode loop. It
     processes raw images passed by the application, producing packets of
-    compressed data. The <code>deadline</code> parameter controls the amount
-    of time in microseconds the encoder should spend working on the frame. For
-    more information on the <code>deadline</code> parameter, see
-    \ref usage_deadline.
-
+    compressed data.
 
     \ref samples