Change VCMFrameBuffer and VCMEncodedFrame to use rotation from base class EncodedImage.

BUG=webrtc:5687

Review-Url: https://codereview.webrtc.org/2037633002
Cr-Commit-Position: refs/heads/master@{#13376}
diff --git a/webrtc/modules/video_coding/encoded_frame.cc b/webrtc/modules/video_coding/encoded_frame.cc
index cc3a91e..23e681d 100644
--- a/webrtc/modules/video_coding/encoded_frame.cc
+++ b/webrtc/modules/video_coding/encoded_frame.cc
@@ -22,7 +22,6 @@
       _missingFrame(false),
       _codec(kVideoCodecUnknown),
       _fragmentation(),
-      _rotation(kVideoRotation_0),
       _rotation_set(false) {
   _codecSpecificInfo.codecType = kVideoCodecUnknown;
 }
@@ -34,7 +33,6 @@
       _missingFrame(false),
       _codec(kVideoCodecUnknown),
       _fragmentation(),
-      _rotation(kVideoRotation_0),
       _rotation_set(false) {
   _codecSpecificInfo.codecType = kVideoCodecUnknown;
   _buffer = NULL;
@@ -55,7 +53,6 @@
       _codecSpecificInfo(rhs._codecSpecificInfo),
       _codec(rhs._codec),
       _fragmentation(),
-      _rotation(rhs._rotation),
       _rotation_set(rhs._rotation_set) {
   _buffer = NULL;
   _size = 0;
@@ -93,7 +90,7 @@
   _length = 0;
   _codecSpecificInfo.codecType = kVideoCodecUnknown;
   _codec = kVideoCodecUnknown;
-  _rotation = kVideoRotation_0;
+  rotation_ = kVideoRotation_0;
   _rotation_set = false;
 }