Remove SkSerializationHelpers.

Move the function definition for EncodeBitmap to SkPicture,
where InstallPixelRefProc has already moved (and where it is
relevant).

Review URL: https://codereview.appspot.com/7386053

git-svn-id: http://skia.googlecode.com/svn/trunk/src@7837 2bbb7eff-a529-9590-31e7-b0007b416f81

diff --git a/core/SkPicture.cpp b/core/SkPicture.cpp
index f86634a..381bbae 100644
--- a/core/SkPicture.cpp
+++ b/core/SkPicture.cpp

@@ -307,7 +307,7 @@
     }
 }
 
-void SkPicture::serialize(SkWStream* stream, SkSerializationHelpers::EncodeBitmap encoder) const {
+void SkPicture::serialize(SkWStream* stream, EncodeBitmap encoder) const {
     SkPicturePlayback* playback = fPlayback;
 
     if (NULL == playback && fRecord) {