Revert of Switch uses of SkChecksum::Compute to Murmur3.

src/gpu/GrProgramDesc.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrProgramDesc_DEFINED
 #define GrProgramDesc_DEFINED
 
@@ skipping 89 matching lines @@
     template<typename T, size_t OFFSET> const T* atOffset() const {
         return reinterpret_cast<const T*>(reinterpret_cast<intptr_t>(fKey.begin()) + OFFSET);
     }
 
     void finalize() {
         int keyLength = fKey.count();
         SkASSERT(0 == (keyLength % 4));
         *(this->atOffset<uint32_t, GrProgramDesc::kLengthOffset>()) = SkToU32(keyLength);
 
         uint32_t* checksum = this->atOffset<uint32_t, GrProgramDesc::kChecksumOffset>();
-        *checksum = SkChecksum::Murmur3(fKey.begin(), keyLength);
+        *checksum = 0;
+        *checksum = SkChecksum::Compute(reinterpret_cast<uint32_t*>(fKey.begin()), keyLength);
     }
 
     // The key, stored in fKey, is composed of four parts:
     // 1. uint32_t for total key length.
     // 2. uint32_t for a checksum.
     // 3. Header struct defined above.  Also room for extensions to the header
     // 4. A Backend specific payload.  Room is preallocated for this
     enum KeyOffsets {
         // Part 1.
         kLengthOffset = 0,
@@ skipping 12 matching lines @@
     };
 
     SkSTArray<kPreAllocSize, uint8_t, true>& key() { return fKey; }
     const SkSTArray<kPreAllocSize, uint8_t, true>& key() const { return fKey; }
 
 private:
     SkSTArray<kPreAllocSize, uint8_t, true> fKey;
 };
 
 #endif