Remove unused protobuf from backend.native

kotlin-native/backend.native/build.gradle

@@ -9,14 +9,8 @@ import org.jetbrains.gradle.plugins.tools.*
 buildscript {
     apply from: "../../kotlin-native/gradle/kotlinGradlePlugin.gradle"
     apply plugin: 'project-report'
-
-    dependencies {
-        classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.8"
-    }
 }
 
-String protobufVersion = '2.6.1'
-apply plugin: "com.google.protobuf"
 apply plugin: 'java'
 apply plugin: 'kotlin'
 apply plugin: org.jetbrains.kotlin.NativeInteropPlugin
@@ -24,11 +18,6 @@ apply plugin: "maven-publish"
 
 sourceSets {
     compiler {
-        proto.srcDir 'compiler/ir/backend.native/src/'
-        java {
-            srcDir 'compiler/ir/backend.native/src/'
-            srcDir 'build/renamed/source/proto/compiler/java'
-        }
         kotlin {
             srcDir 'compiler/ir/backend.native/src/'
             srcDir '../shared/src/main/kotlin'
@@ -40,16 +29,11 @@ sourceSets {
         resources.srcDir VersionGeneratorKt.kotlinNativeVersionResourceFile(project).parentFile.parent
     }
     cli_bc {
-        java.srcDir 'cli.bc/src'
         kotlin.srcDir 'cli.bc/src'
     }
 }
 
 compileCompilerKotlin {
-    dependsOn('renamePackage')
-    // The protobuf plugin specifies this dependency for java by itself,
-    // but not for Kotlin.
-    dependsOn('generateCompilerProto')
     kotlinOptions.jvmTarget = "1.8"
     kotlinOptions.allWarningsAsErrors=true
     kotlinOptions.freeCompilerArgs += ['-Xopt-in=kotlin.RequiresOptIn', '-Xopt-in=org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI', '-Xskip-prerelease-check']
@@ -59,27 +43,6 @@ compileCli_bcKotlin {
     kotlinOptions.freeCompilerArgs += ['-Xskip-prerelease-check']
 }
 
-compileCompilerJava {
-    dependsOn('renamePackage')
-}
-
-task copyGenerated(type: Copy) {
-    dependsOn('generateCompilerProto')
-    from 'build/generated/source/proto/compiler/java'
-    into 'build/renamed/source/proto/compiler/java'
-    filter { line -> line.replaceAll("com.google.protobuf", "org.jetbrains.kotlin.protobuf") }
-    outputs.dir('build/renamed')
-}
-
-task deleteGenerated(type: Delete) {
-    dependsOn('copyGenerated')
-    delete 'build/generated/source/proto/compiler/java'
-}
-
-task renamePackage {
-    dependsOn('copyGenerated', 'deleteGenerated')
-}
-
 kotlinNativeInterop {
     llvm {
 
@@ -158,8 +121,6 @@ dependencies {
 
     compilerCompile project(":kotlin-native:utilities:basic-utils")
 
-    compilerCompile "com.google.protobuf:protobuf-java:${protobufVersion}"
-
     compilerCompile project(kotlinCompilerModule)
     compilerCompile project(":native:kotlin-native-utils")
     compilerCompile project(":core:descriptors")
@@ -312,19 +273,6 @@ externalJars.each { arg ->
 task external_jars(type: Copy) {
     dependsOn externalJars.collect { "${it}Copy" }
     dependsOn trove4jCopy
-
-    from configurations.compilerCompile {
-
-        include "protobuf-java-${protobufVersion}.jar"
-
-        into 'build/external_jars'
-    }
-}
-
-protobuf {
-    protoc {
-        artifact = "com.google.protobuf:protoc:${protobufVersion}"
-    }
 }
 
 task debugCompiler(type: JavaExec) {