Cleaning up trailing spaces and typos.

src/core/SkMipMap.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkMipMap.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 339 matching lines @@
 
     if (level > fCount) {
         level = fCount;
     }
     if (levelPtr) {
         *levelPtr = fLevels[level - 1];
     }
     return true;
 }
 
-// Helper which extacts a pixmap from the src bitmap
+// Helper which extracts a pixmap from the src bitmap
 //
 SkMipMap* SkMipMap::Build(const SkBitmap& src, SkDiscardableFactoryProc fact) {
     SkAutoPixmapUnlock srcUnlocker;
     if (!src.requestLock(&srcUnlocker)) {
         return nullptr;
     }
     const SkPixmap& srcPixmap = srcUnlocker.pixmap();
     // Try to catch where we might have returned nullptr for src crbug.com/492818
     if (nullptr == srcPixmap.addr()) {
         sk_throw();
     }
     return Build(srcPixmap, fact);
 }