Revert of Update mojo sdk to rev afb4440fd5a10cba980878c326180b7ad7960480

mojo/public/java/system/src/org/chromium/mojo/system/DataPipe.java

Index: mojo/public/java/system/src/org/chromium/mojo/system/DataPipe.java
diff --git a/mojo/public/java/system/src/org/chromium/mojo/system/DataPipe.java b/mojo/public/java/system/src/org/chromium/mojo/system/DataPipe.java
index a5b77ae9ecb4b0687c8e3d8bde7595b74ed91e8b..4cd74e15685acc9835da711fcec46aeb081057e3 100644
--- a/mojo/public/java/system/src/org/chromium/mojo/system/DataPipe.java
+++ b/mojo/public/java/system/src/org/chromium/mojo/system/DataPipe.java
@@ -161,7 +161,6 @@
         private static final int FLAG_NONE = 0;
         private static final int FLAG_ALL_OR_NONE = 1 << 0;
         private static final int FLAG_QUERY = 1 << 2;
-        private static final int FLAG_PEEK = 1 << 3;
 
         /**
          * Immutable flag with not bit set.
@@ -190,25 +189,13 @@
 
         /**
          * Change the query bit of this flag. If set query the number of elements available to read.
-         * Mutually exclusive with |discard| and |allOrNone| is ignored if this flag is set.
+         * Mutually exclusive with |dicard| and |allOrNone| is ignored if this flag is set.
          *
          * @param query the new value of the query bit.
          * @return this.
          */
         public ReadFlags query(boolean query) {
             return setFlag(FLAG_QUERY, query);
-        }
-
-        /**
-         * Change the peek bit of this flag. If set, read the requested number of elements, and
-         * leave those elements in the pipe. A later read will return the same data.
-         * Mutually exclusive with |discard| and |query|.
-         *
-         * @param peek the new value of the peek bit.
-         * @return this.
-         */
-        public ReadFlags peek(boolean peek) {
-            return setFlag(FLAG_PEEK, peek);
         }
 
         /**