[SPARK-14952][CORE][ML] Remove methods that were deprecated in 1.6.0

#### What changes were proposed in this pull request?

This PR removes three methods the were deprecated in 1.6.0:
- `PortableDataStream.close()`
- `LinearRegression.weights`
- `LogisticRegression.weights`

The rationale for doing this is that the impact is small and that Spark 2.0 is a major release.

#### How was this patch tested?
Compilation succeded.

Author: Herman van Hovell <hvanhovell@questtec.nl>

Closes #12732 from hvanhovell/SPARK-14952.

1 files changed, 0 insertions, 9 deletions

diff --git a/core/src/main/scala/org/apache/spark/input/PortableDataStream.scala b/core/src/main/scala/org/apache/spark/input/PortableDataStream.scala
index 18cb7631b3..f66510b6f9 100644
--- a/core/src/main/scala/org/apache/spark/input/PortableDataStream.scala
+++ b/core/src/main/scala/org/apache/spark/input/PortableDataStream.scala
@@ -185,15 +185,6 @@ class PortableDataStream(
     }
   }
 
-  /**
-   * Closing the PortableDataStream is not needed anymore. The user either can use the
-   * PortableDataStream to get a DataInputStream (which the user needs to close after usage),
-   * or a byte array.
-   */
-  @deprecated("Closing the PortableDataStream is not needed anymore.", "1.6.0")
-  def close(): Unit = {
-  }
-
   def getPath(): String = path
 }