[Extensions] Remove JSONFeatureProvider, SimpleFeature::Parse

tools/json_schema_compiler/feature_compiler_test.py

Index: tools/json_schema_compiler/feature_compiler_test.py
diff --git a/tools/json_schema_compiler/feature_compiler_test.py b/tools/json_schema_compiler/feature_compiler_test.py
index 4462e46d1095620e3e6d4ecb6f79f57686d85544..37d829eedebca0a0964916358834d5f4ce7dc942 100755
--- a/tools/json_schema_compiler/feature_compiler_test.py
+++ b/tools/json_schema_compiler/feature_compiler_test.py
@@ -50,6 +50,13 @@ class FeatureCompilerTest(unittest.TestCase):
     })
     self.assertFalse(f.errors)
 
+  def testInvalidAll(self):
+    f = self._parseFeature({
+      'channel': 'stable',
+      'dependencies': 'all',
+    })
+    self._hasError(f, 'Illegal value: "all"')
+
   def testUnknownKeyError(self):
     f = self._parseFeature({
       'contexts': ['blessed_extension'],