Cleanup: Use SkAutoGraphics in gm and tests.

tests/skia_test.cpp

Index: tests/skia_test.cpp
diff --git a/tests/skia_test.cpp b/tests/skia_test.cpp
index 172328ee4abf1d44bd9414e9917b71c86fb6edf7..5488d81044128c620742075d2fb8e95ac113526b 100644
--- a/tests/skia_test.cpp
+++ b/tests/skia_test.cpp
@@ -125,7 +125,7 @@ int test_main() {
     }
 #endif
 
-    SkGraphics::Init();
+    SkAutoGraphics ag;
 
     {
         SkString header("Skia UnitTests:");
@@ -211,7 +211,6 @@ int test_main() {
         SkDebugf("\nFinished %d tests, %d failures, %d skipped. (%d internal tests)",
                  toRun, failCount, skipCount, reporter.countTests());
     }
-    SkGraphics::Term();
 
     SkDebugf("\n");
     return (failCount == 0) ? 0 : 1;