Revert "Allow proto builds to pass in java proto params."

This reverts commit 28b46fc16c026365378909f1cc88fad0d3b2395c.

Speculative fix for master builds. I cannot repro the break the bots
are seeing locally, but it seems related to building protobufs and this
CL was in the first broken build.
diff --git a/core/base_rules.mk b/core/base_rules.mk
index 5d27fa8..f92cf6a 100644
--- a/core/base_rules.mk
+++ b/core/base_rules.mk
@@ -268,7 +268,6 @@
   endif
 endif
 $(proto_java_sources_file_stamp): PRIVATE_PROTOC_FLAGS := $(LOCAL_PROTOC_FLAGS)
-$(proto_java_sources_file_stamp): PRIVATE_PROTO_JAVA_OUTPUT_PARAMS := $(LOCAL_PROTO_JAVA_OUTPUT_PARAMS)
 $(proto_java_sources_file_stamp) : $(proto_sources_fullpath) $(PROTOC)
 	$(call transform-proto-to-java)
 
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index ca1fea7..3aed193 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -120,7 +120,6 @@
 LOCAL_DEX_PREOPT:= # '',true,false,nostripping
 LOCAL_PROTOC_OPTIMIZE_TYPE:= # lite(default),micro,nano,full
 LOCAL_PROTOC_FLAGS:=
-LOCAL_PROTO_JAVA_OUTPUT_PARAMS:=
 LOCAL_NO_CRT:=
 LOCAL_PROPRIETARY_MODULE:=
 LOCAL_PRIVILEGED_MODULE:=
diff --git a/core/definitions.mk b/core/definitions.mk
index d7ac4c1..990e880 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -889,11 +889,13 @@
 @echo "Protoc: $@ <= $(PRIVATE_PROTO_SRC_FILES)"
 @rm -rf $(PRIVATE_PROTO_JAVA_OUTPUT_DIR)
 @mkdir -p $(PRIVATE_PROTO_JAVA_OUTPUT_DIR)
-$(hide) $(PROTOC) \
-        $(PRIVATE_PROTO_JAVA_OUTPUT_OPTION)="$(PRIVATE_PROTO_JAVA_OUTPUT_PARAMS):$(PRIVATE_PROTO_JAVA_OUTPUT_DIR)" \
-        $(PRIVATE_PROTOC_FLAGS) \
+$(hide) for f in $(PRIVATE_PROTO_SRC_FILES); do \
+        $(PROTOC) \
         $(addprefix --proto_path=, $(PRIVATE_PROTO_INCLUDES)) \
-        $(PRIVATE_PROTO_SRC_FILES)
+        $(PRIVATE_PROTO_JAVA_OUTPUT_OPTION)=$(PRIVATE_PROTO_JAVA_OUTPUT_DIR) \
+        $(PRIVATE_PROTOC_FLAGS) \
+        $$f || exit 33; \
+        done
 $(hide) touch $@
 endef