Revert "Update language v1 with new features. (#458)" (#459)

This reverts commit 555271db58.

google/cloud/language/v1/language_gapic.yaml

@@ -66,18 +66,6 @@ interfaces:
     retry_codes_name: idempotent
     retry_params_name: default
     timeout_millis: 30000
-  - name: AnalyzeEntitySentiment
-    flattening:
-      groups:
-      - parameters:
-        - document
-        - encoding_type
-    required_fields:
-    - document
-    request_object_method: true
-    retry_codes_name: idempotent
-    retry_params_name: default
-    timeout_millis: 30000
   - name: AnalyzeSyntax
     flattening:
       groups:
@@ -90,17 +78,6 @@ interfaces:
     retry_codes_name: idempotent
     retry_params_name: default
     timeout_millis: 30000
-  - name: ClassifyText
-    flattening:
-      groups:
-      - parameters:
-        - document
-    required_fields:
-    - document
-    request_object_method: true
-    retry_codes_name: idempotent
-    retry_params_name: default
-    timeout_millis: 30000
   - name: AnnotateText
     flattening:
       groups: