Remove kImageIsImmutable_Flag.

include/core/SkBitmap.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkBitmap_DEFINED
 #define SkBitmap_DEFINED
 
@@ skipping 708 matching lines @@
     mutable SkPixelRef* fPixelRef;
     mutable int         fPixelLockCount;
     // These are just caches from the locked pixelref
     mutable void*       fPixels;
     mutable SkColorTable* fColorTable;    // only meaningful for kIndex8
 
     SkIPoint    fPixelRefOrigin;
 
     enum Flags {
         kImageIsVolatile_Flag   = 0x02,
-        kImageIsImmutable_Flag  = 0x04,
 #ifdef SK_BUILD_FOR_ANDROID
         /* A hint for the renderer responsible for drawing this bitmap
          * indicating that it should attempt to use mipmaps when this bitmap
          * is drawn scaled down.
          */
         kHasHardwareMipMap_Flag = 0x08,
 #endif
     };
 
     SkImageInfo fInfo;
@@ skipping 129 matching lines @@
 #ifdef SK_SUPPORT_LEGACY_BITMAP_CONFIG
 ///////////////////////////////////////////////////////////////////////////////
 //
 // Helpers until we can fully deprecate SkBitmap::Config
 //
 SK_API SkBitmap::Config SkColorTypeToBitmapConfig(SkColorType);
 SK_API SkColorType SkBitmapConfigToColorType(SkBitmap::Config);
 #endif
 
 #endif