Use top-level directory gradle and delete from third_party

.gitignore

@@ -47,4 +47,3 @@ lib/kotlin*
 .gradle
 /build/
 gradle-app.setting
-gradle/wrapper/gradle-wrapper.jar

build.gradle.kts

@@ -264,7 +264,7 @@ tasks {
 }
 
 // A task to print the classpath used for compiling an IntelliJ plugin
-// Run with `./third_party/gradlew printCompileClasspath --no-configuration-cache `
+// Run with `./gradlew printCompileClasspath --no-configuration-cache `
 tasks.register("printCompileClasspath") {
   doLast {
     println("--- Begin Compile Classpath ---")
@@ -296,8 +296,6 @@ val writeLicenseKey = tasks.register("writeLicenseKey") {
     if (readFile.isFile) {
       val licenseKey = readFile.readText(Charsets.UTF_8)
       licenseFile.writeText("jxbrowser.license.key=$licenseKey")
-    } else {
-      println("$readFile is not a file")
     }
   }
 }

tool/kokoro/build.sh

@@ -5,6 +5,6 @@ setup
 
 echo "kokoro build start"
 
-./third_party/gradlew buildPlugin
+./gradlew buildPlugin
 
 echo "kokoro build finished"

tool/kokoro/deploy.sh

@@ -5,7 +5,7 @@ setup
 
 echo "kokoro build start"
 
-./third_party/gradlew buildPlugin -Pdev-version=88.0
+./gradlew buildPlugin -Pdev-version=88.0
 
 echo "kokoro build finished"
 

tool/kokoro/setup.sh

@@ -45,5 +45,5 @@ setup() {
   export NO_FS_ROOTS_ACCESS_CHECK=true
 
   (cd tool/plugin; echo "dart pub get `pwd`"; dart pub get --no-precompile)
-  ./third_party/gradlew --version
+  ./gradlew --version
 }