Change old PRG to be SkLCGRandom; change new one to SkRandom

The goal here is to get people to start using the new random number
generator, while leaving the old one in place so we don't have to 
rebaseline GMs.

R=reed@google.com, bsalomon@google.com

Author: jvanverth@google.com

Review URL: https://chromiumcodereview.appspot.com/23576015

git-svn-id: http://skia.googlecode.com/svn/trunk@11169 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/SortTest.cpp b/tests/SortTest.cpp
index 6bfb300..28c6e68 100644
--- a/tests/SortTest.cpp
+++ b/tests/SortTest.cpp
@@ -15,7 +15,7 @@
     }
 }
 
-static void rand_array(SkMWCRandom& rand, int array[], int n) {
+static void rand_array(SkRandom& rand, int array[], int n) {
     for (int j = 0; j < n; j++) {
         array[j] = rand.nextS() & 0xFF;
     }
@@ -40,7 +40,7 @@
     /** The random numbers are copied into this array, sorted by an SkSort,
         then this array is compared against the reference sort. */
     int workingArray[SK_ARRAY_COUNT(randomArray)];
-    SkMWCRandom    rand;
+    SkRandom    rand;
 
     for (int i = 0; i < 10000; i++) {
         int count = rand.nextRangeU(1, SK_ARRAY_COUNT(randomArray));