JPS plugin: remove unnecessary method KotlinSourceFileCollector#hasDirtyFiles.

jps-plugin/src/org/jetbrains/jet/jps/build/KotlinBuilder.java

@@ -98,7 +98,7 @@ public class KotlinBuilder extends ModuleLevelBuilder {
         ModuleBuildTarget representativeTarget = chunk.representativeTarget();
 
         // For non-incremental build: take all sources
-        if (!KotlinSourceFileCollector.hasDirtyFiles(dirtyFilesHolder)) {
+        if (!dirtyFilesHolder.hasDirtyFiles()) {
             return ExitCode.NOTHING_DONE;
         }
         List<File> sourceFiles = KotlinSourceFileCollector.getAllKotlinSourceFiles(representativeTarget);

jps-plugin/src/org/jetbrains/jet/jps/build/KotlinSourceFileCollector.java

@@ -16,7 +16,6 @@
 
 package org.jetbrains.jet.jps.build;
 
-import com.intellij.openapi.util.Ref;
 import com.intellij.openapi.util.io.FileUtil;
 import com.intellij.util.Processor;
 import com.intellij.util.containers.ContainerUtil;
@@ -51,21 +50,6 @@ public class KotlinSourceFileCollector {
         return sourceFiles;
     }
 
-    // For incremental compilation
-    public static boolean hasDirtyFiles(DirtyFilesHolder<JavaSourceRootDescriptor, ModuleBuildTarget> dirtyFilesHolder)
-            throws IOException {
-        final Ref<Boolean> result = Ref.create(false);
-
-        dirtyFilesHolder.processDirtyFiles(new FileProcessor<JavaSourceRootDescriptor, ModuleBuildTarget>() {
-            @Override
-            public boolean apply(ModuleBuildTarget target, File file, JavaSourceRootDescriptor root) throws IOException {
-                result.set(true);
-                return false;
-            }
-        });
-        return result.get();
-    }
-
     @NotNull
     public static List<File> getAllKotlinSourceFiles(@NotNull ModuleBuildTarget target) {
         final List<File> result = ContainerUtil.newArrayList();