Update google-protobuf and remove workaround

In order to comply with the no-unsafe-eval CSP, we worked around issue
protocolbuffers/protobuf#6770 by including a
modified version of google-protobuf under the src/third_party folder.

This CL updates the google-protobuf version to one which fixes this bug,
and removes the workaround.

Change-Id: Ida7943bad452ee930defbc136602a34910a41977

Makefile

@@ -8,9 +8,7 @@ RELEASE_SCRIPT := bash tools/release.bash
 grpc_proto_gen:
 	(cd src/killSwitch && \
 		protoc -I=. --js_out=import_style=commonjs_strict:. api_proto/*.proto && \
-		protoc -I. --grpc-web_out=import_style=commonjs,mode=grpcwebtext:. api_proto/*.proto && \
-		(cd api_proto && \
-			sed -i -E "s/require\('google-protobuf\//require('..\/..\/third_party\/google-protobuf-commonjs_strict\//" *_pb.js ))
+		protoc -I. --grpc-web_out=import_style=commonjs,mode=grpcwebtext:. api_proto/*.proto)
 
 node_deps:
 	npm ci --no-save

package.json

@@ -45,7 +45,7 @@
     "@material/menu": "^10.0.0",
     "@material/tooltip": "^12.0.0",
     "async-mutex": "^0.3.2",
-    "google-protobuf": "^3.18.0-rc.2",
+    "google-protobuf": "^3.19.3",
     "grpc-web": "^1.2.1",
     "idb": "^6.1.2",
     "poll-until-promise": "^3.6.1",