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

BUILD.gn

 # Copyright 2016 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 declare_args() {
 }
 
 skia_public_includes = [
   "include/android",
@@ skipping 439 matching lines @@
                               rebase_path("tests"),
                             ],
                             "list lines",
                             [])
 
 test_lib("tests") {
   public_include_dirs = [ "tests" ]
   sources = tests_sources - [
               rebase_path("tests/FontMgrAndroidParserTest.cpp"),  # Android only
               rebase_path("tests/PathOpsSkpClipTest.cpp"),  # alternate main
+              rebase_path("tests/RTConfRegistryTest.cpp"),  # TODO: delete
               rebase_path("tests/SkSLErrorTest.cpp"),  # TODO: make work
               rebase_path("tests/SkSLGLSLTest.cpp"),  # TODO: make work
               rebase_path("tests/SkpSkGrTest.cpp"),  # doesn't compile
               rebase_path("tests/skia_test.cpp"),  # alternate main
             ]
   deps = [
     ":flags",
     ":gpu_tool_utils",
     ":skia",
     ":tool_utils",
@@ skipping 67 matching lines @@
       ":flags",
       ":gm",
       ":gpu_tool_utils",
       ":skia",
       ":tool_utils",
       "//third_party/jsoncpp",
     ]
     testonly = true
   }
 }