Fix sky include guards to match Chromium style

sky/engine/wtf/PartitionAlloc.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 10 matching lines @@
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef WTF_PartitionAlloc_h
-#define WTF_PartitionAlloc_h
+#ifndef SKY_ENGINE_WTF_PARTITIONALLOC_H_
+#define SKY_ENGINE_WTF_PARTITIONALLOC_H_
 
 // DESCRIPTION
 // partitionAlloc() / partitionAllocGeneric() and partitionFree() /
 // partitionFreeGeneric() are approximately analagous to malloc() and free().
 //
 // The main difference is that a PartitionRoot / PartitionRootGeneric object
 // must be supplied to these functions, representing a specific "heap partition"
 // that will be used to satisfy the allocation. Different partitions are
 // guaranteed to exist in separate address spaces, including being separate from
 // the main system heap. If the contained objects are all freed, physical memory
@@ skipping 619 matching lines @@
 using WTF::partitionAllocShutdown;
 using WTF::partitionAlloc;
 using WTF::partitionFree;
 using WTF::partitionAllocGeneric;
 using WTF::partitionFreeGeneric;
 using WTF::partitionReallocGeneric;
 using WTF::partitionAllocActualSize;
 using WTF::partitionAllocSupportsGetSize;
 using WTF::partitionAllocGetSize;
 
-#endif // WTF_PartitionAlloc_h
+#endif  // SKY_ENGINE_WTF_PARTITIONALLOC_H_