Fix minor valgrind-found memory leaks

tests/Matrix44Test.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Test.h"
 #include "SkMatrix44.h"
 
@@ skipping 62 matching lines @@
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 static bool bits_isonly(int value, int mask) {
     return 0 == (value & ~mask);
 }
 
 static void test_constructor(skiatest::Reporter* reporter) {
     // Allocate a matrix on the heap
     SkMatrix44* placeholderMatrix = new SkMatrix44();
+    SkAutoTDelete<SkMatrix44> deleteMe(placeholderMatrix);
+
     for (int row = 0; row < 4; ++row) {
         for (int col = 0; col < 4; ++col) {
             placeholderMatrix->setDouble(row, col, row * col);
         }
     }
 
     // Use placement-new syntax to trigger the constructor on top of the heap
     // address we already initialized. This allows us to check that the
     // constructor did avoid initializing the matrix contents.
     SkMatrix44* testMatrix = new(placeholderMatrix) SkMatrix44(SkMatrix44::kUninitialized_Constructor);
@@ skipping 338 matching lines @@
     test_transpose(reporter);
     test_get_set_double(reporter);
     test_set_row_col_major(reporter);
     test_translate(reporter);
     test_scale(reporter);
     test_map2(reporter);
 }
 
 #include "TestClassDef.h"
 DEFINE_TESTCLASS("Matrix44", Matrix44TestClass, TestMatrix44)