Rename extractMethods.ts to extractFunctions.ts for consistency

Jakefile.js

@@ -139,7 +139,7 @@ var harnessSources = harnessCoreSources.concat([
     "matchFiles.ts",
     "initializeTSConfig.ts",
     "extractConstants.ts",
-    "extractMethods.ts",
+    "extractFunctions.ts",
     "printer.ts",
     "textChanges.ts",
     "telemetry.ts",

src/harness/tsconfig.json

@@ -129,7 +129,7 @@
         "./unittests/transform.ts",
         "./unittests/customTransforms.ts",
         "./unittests/extractConstants.ts",
-        "./unittests/extractMethods.ts",
+        "./unittests/extractFunctions.ts",
         "./unittests/textChanges.ts",
         "./unittests/telemetry.ts",
         "./unittests/languageService.ts",