Remove bitmap reuse from SkImageDecoder.

src/images/SkImageDecoder.cpp

Index: src/images/SkImageDecoder.cpp
diff --git a/src/images/SkImageDecoder.cpp b/src/images/SkImageDecoder.cpp
index 38aa7fda0d143a2134d89253c179f46781bb1f30..0aa752e38f937cff246d2bf6415f070b169cd026 100644
--- a/src/images/SkImageDecoder.cpp
+++ b/src/images/SkImageDecoder.cpp
@@ -164,19 +164,12 @@ SkBitmap::Config SkImageDecoder::getPrefConfig(SrcDepth srcDepth,
 }
 
 bool SkImageDecoder::decode(SkStream* stream, SkBitmap* bm,
-                            SkBitmap::Config pref, Mode mode, bool reuseBitmap) {
+                            SkBitmap::Config pref, Mode mode) {
     // we reset this to false before calling onDecode
     fShouldCancelDecode = false;
     // assign this, for use by getPrefConfig(), in case fUsePrefTable is false
     fDefaultPref = pref;
 
-    if (reuseBitmap) {
-        SkAutoLockPixels alp(*bm);
-        if (NULL != bm->getPixels()) {
-            return this->onDecode(stream, bm, mode);
-        }
-    }
-
     // pass a temporary bitmap, so that if we return false, we are assured of
     // leaving the caller's bitmap untouched.
     SkBitmap    tmp;