Remove dead code from AssetStreamAdapter.

After "Use at least SkStreamAsset for SkTypefaces." there is now dead
code in AssetStreamAdapter. Remove the code and update the users.

Change-Id: I17a9d82dd6ca4d87a951c1570dc91de7f2fc54f2
diff --git a/core/jni/android/graphics/Utils.cpp b/core/jni/android/graphics/Utils.cpp
index a134d4b..3c471bd 100644
--- a/core/jni/android/graphics/Utils.cpp
+++ b/core/jni/android/graphics/Utils.cpp
@@ -19,21 +19,11 @@
 
 using namespace android;
 
-AssetStreamAdaptor::AssetStreamAdaptor(Asset* asset, OwnAsset ownAsset,
-                                       HasMemoryBase hasMemoryBase)
+AssetStreamAdaptor::AssetStreamAdaptor(Asset* asset)
     : fAsset(asset)
-    , fMemoryBase(kYes_HasMemoryBase == hasMemoryBase ?
-                  asset->getBuffer(false) : NULL)
-    , fOwnAsset(ownAsset)
 {
 }
 
-AssetStreamAdaptor::~AssetStreamAdaptor() {
-    if (kYes_OwnAsset == fOwnAsset) {
-        delete fAsset;
-    }
-}
-
 bool AssetStreamAdaptor::rewind() {
     off64_t pos = fAsset->seek(0, SEEK_SET);
     if (pos == (off64_t)-1) {