Switch SkAutoMalloc to SkAutoTMalloc to avoid cast

gm/colorcube.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkColorCubeFilter.h"
 #include "SkData.h"
 #include "SkGradientShader.h"
+#include "SkTemplates.h"
 
 namespace skiagm {
 
 static SkShader* MakeLinear() {
     static const SkPoint pts[2] = {
             { 0, 0 },
             { SkIntToScalar(80), SkIntToScalar(80) }
         };
     static const SkColor colors[] = { SK_ColorYELLOW, SK_ColorBLUE };
     return SkGradientShader::CreateLinear(
@@ skipping 43 matching lines @@
         SkShader* shader = MakeLinear();
         paint.setShader(shader);
         SkRect r = { 0, 0, SkIntToScalar(80), SkIntToScalar(80) };
         canvas.drawRect(r, paint);
         shader->unref();
     }
 
     void make_3Dlut(SkData** data, int size, bool invR, bool invG, bool invB) {
         *data = SkData::NewUninitialized(sizeof(SkColor) * size * size * size);
         SkColor* pixels = (SkColor*)((*data)->writable_data());
-        SkAutoMalloc lutMemory(size);
-        SkAutoMalloc invLutMemory(size);
-        uint8_t* lut = (uint8_t*)lutMemory.get();
-        uint8_t* invLut = (uint8_t*)invLutMemory.get();
+        SkAutoTMalloc<uint8_t> lutMemory(size);
+        SkAutoTMalloc<uint8_t> invLutMemory(size);
+        uint8_t* lut = lutMemory.get();
+        uint8_t* invLut = invLutMemory.get();
         const int maxIndex = size - 1;
         for (int i = 0; i < size; i++) {
             lut[i] = (i * 255) / maxIndex;
             invLut[i] = ((maxIndex - i) * 255) / maxIndex;
         }
         for (int r = 0; r < size; ++r) {
             for (int g = 0; g < size; ++g) {
                 for (int b = 0; b < size; ++b) {
                     pixels[(size * ((size * b) + g)) + r] = sk_tool_utils::color_to_565(
                             SkColorSetARGB(0xFF,
@@ skipping 43 matching lines @@
     SkData* f3DLut32;
     SkData* f3DLut64;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static GM* MyFactory(void*) { return new ColorCubeGM; }
 static GMRegistry reg(MyFactory);
 
 }