Use the correct homophone of 'there'.

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 482 matching lines @@
     /** Return the bitmap's colortable, if it uses one (i.e. colorType is
         Index_8) and the pixels are locked.
         Otherwise returns NULL. Does not affect the colortable's
         reference count.
     */
     SkColorTable* getColorTable() const { return fColorTable; }
 
     /** Returns a non-zero, unique value corresponding to the pixels in our
         pixelref. Each time the pixels are changed (and notifyPixelsChanged
         is called), a different generation ID will be returned. Finally, if
-        their is no pixelRef then zero is returned.
+        there is no pixelRef then zero is returned.
     */
     uint32_t getGenerationID() const;
 
     /** Call this if you have changed the contents of the pixels. This will in-
         turn cause a different generation ID value to be returned from
         getGenerationID().
     */
     void notifyPixelsChanged() const;
 
     /**
@@ skipping 398 matching lines @@
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 //
 // Helpers until we can fully deprecate SkBitmap::Config
 //
 extern SkBitmap::Config SkColorTypeToBitmapConfig(SkColorType);
 extern SkColorType SkBitmapConfigToColorType(SkBitmap::Config);
 
 #endif