Revert of SkRTConf: reduce functionality to what we use, increase simplicity

tests/RTConfRegistryTest.cpp

+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkRTConf.h"
+#include "SkOSEnvironment.h"
+#include "Test.h"
+
+// Friended proxy for SkRTConfRegistry::parse()
+template <typename T>
+bool test_rt_conf_parse(SkRTConfRegistry* reg, const char* key, T* value) {
+    return reg->parse(key, value);
+}
+
+DEF_TEST(SkRTConfRegistry, reporter) {
+    SkRTConfRegistry reg;
+
+    sk_setenv("skia_nonexistent_item", "132");
+    int result = 0;
+    test_rt_conf_parse(&reg, "nonexistent.item", &result);
+    REPORTER_ASSERT(reporter, result == 132);
+}