Remove protobuf from Java

java/java/build.gradle

@@ -3,14 +3,9 @@ buildscript {
         google()
         mavenCentral()
     }
-
-    dependencies {
-        classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.10'
-    }
 }
 
 apply plugin: 'java'
-apply plugin: 'com.google.protobuf'
 apply plugin: 'maven'
 apply plugin: 'signing'
 
@@ -33,31 +28,9 @@ sourceSets {
 }
 
 dependencies {
-    compile 'com.google.protobuf:protobuf-javalite:3.10.0'
-
     testCompile ('junit:junit:3.8.2')
 }
 
-protobuf {
-    protoc {
-        artifact = 'com.google.protobuf:protoc:3.10.0'
-    }
-    generateProtoTasks {
-        all().each { task ->
-            task.builtins {
-                java {
-                    option "lite"
-                }
-            }
-        }
-    }
-}
-
-sourceSets {
-    main.proto.srcDir '../protobuf'
-}
-
-
 test {
     testLogging {
         events 'passed'

java/java/src/main/java/org/whispersystems/libsignal/protocol/SignalMessage.java

@@ -6,9 +6,6 @@
 package org.whispersystems.libsignal.protocol;
 
 import org.signal.client.internal.Native;
-import com.google.protobuf.ByteString;
-import com.google.protobuf.InvalidProtocolBufferException;
-
 import org.whispersystems.libsignal.IdentityKey;
 import org.whispersystems.libsignal.InvalidKeyException;
 import org.whispersystems.libsignal.InvalidMessageException;

java/java/src/main/java/org/whispersystems/libsignal/state/SessionState.java

@@ -13,7 +13,6 @@ import org.whispersystems.libsignal.ecc.ECKeyPair;
 import org.whispersystems.libsignal.ecc.ECPublicKey;
 import org.whispersystems.libsignal.InvalidKeyException;
 import java.io.IOException;
-import static org.whispersystems.libsignal.state.StorageProtos.SessionStructure;
 
 public class SessionState {
   private long handle;
@@ -64,10 +63,6 @@ public class SessionState {
     this.handle = Native.SessionState_Deserialize(serialized);
   }
 
-  public SessionState(SessionStructure sessionStructure) {
-    this.handle = Native.SessionState_Deserialize(sessionStructure.toByteArray());
-  }
-
   SessionState(long handle) {
     this.handle = handle;
   }