Clean up useless comments in SkScaledImageCache.h

src/core/SkScaledImageCache.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkScaledImageCache_DEFINED
 #define SkScaledImageCache_DEFINED
 
@@ skipping 57 matching lines @@
      */
     typedef SkDiscardableMemory* (*DiscardableFactory)(size_t bytes);
 
     /*
      *  The following static methods are thread-safe wrappers around a global
      *  instance of this cache.
      */
 
     static ID* FindAndLock(const Key&, SkBitmap* result);
     static ID* AddAndLock(const Key&, const SkBitmap& result);
-    
+
     static ID* FindAndLock(const Key&, const SkMipMap** result);
     static ID* AddAndLock(const Key&, const SkMipMap* result);
-    
+
     static void Unlock(ID*);
 
     static size_t GetTotalBytesUsed();
     static size_t GetTotalByteLimit();
     static size_t SetTotalByteLimit(size_t newLimit);
 
     static size_t SetSingleAllocationByteLimit(size_t);
     static size_t GetSingleAllocationByteLimit();
 
     static SkBitmap::Allocator* GetAllocator();
@@ skipping 29 matching lines @@
      *
      *  If a match is not found, outBitmap will be unmodifed, and NULL will be returned.
      */
     ID* findAndLock(const Key& key, SkBitmap* outBitmap);
     ID* findAndLock(const Key& key, const SkMipMap** returnedMipMap);
 
     /**
      *  To add a new bitmap (or mipMap) to the cache, call
      *  AddAndLock. Use the returned ptr to unlock the cache when you
      *  are done using scaled.
-     *
-     *  Use (generationID, width, and height) or (original, scaleX,
-     *  scaleY) or (original) as a search key
      */
     ID* addAndLock(const Key&, const SkBitmap& bitmap);
     ID* addAndLock(const Key&, const SkMipMap* mipMap);
 
     /**
      *  Given a non-null ID ptr returned by either findAndLock or addAndLock,
      *  this releases the associated resources to be available to be purged
      *  if needed. After this, the cached bitmap should no longer be
      *  referenced by the caller.
      */
@@ skipping 54 matching lines @@
 
     void init();    // called by constructors
 
 #ifdef SK_DEBUG
     void validate() const;
 #else
     void validate() const {}
 #endif
 };
 #endif