Warn user if DART_SDK does not match editor SDK

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/sdk/DirectoryBasedDartSdk.java

 /*
  * Copyright (c) 2012, the Dart project authors.
  * 
  * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
  * in compliance with the License. You may obtain a copy of the License at
  * 
  * http://www.eclipse.org/legal/epl-v10.html
  * 
  * Unless required by applicable law or agreed to in writing, software distributed under the License
  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
@@ skipping 65 matching lines @@
   private static final String BIN_DIRECTORY_NAME = "bin"; //$NON-NLS-1$
 
   /**
    * The name of the directory within the SDK directory that contains Chromium.
    */
   private static final String CHROMIUM_DIRECTORY_NAME = "chromium"; //$NON-NLS-1$
 
   /**
    * The name of the environment variable whose value is the path to the default Dart SDK directory.
    */
-  private static final String DART_SDK_ENVIRONMENT_VARIABLE_NAME = "DART_SDK"; //$NON-NLS-1$
+  public static final String DART_SDK_ENVIRONMENT_VARIABLE_NAME = "DART_SDK"; //$NON-NLS-1$
 
   /**
    * The name of the file containing the Dartium executable on Linux.
    */
   private static final String DARTIUM_EXECUTABLE_NAME_LINUX = "chrome"; //$NON-NLS-1$
 
   /**
    * The name of the file containing the Dartium executable on Macintosh.
    */
   private static final String DARTIUM_EXECUTABLE_NAME_MAC = "Chromium.app/Contents/MacOS/Chromium"; //$NON-NLS-1$
@@ skipping 69 matching lines @@
    */
   public static DirectoryBasedDartSdk getDefaultSdk() {
     File sdkDirectory = getDefaultSdkDirectory();
     if (sdkDirectory == null) {
       return null;
     }
     return new DirectoryBasedDartSdk(sdkDirectory);
   }
 
   /**
-   * Return the default Dart SDK, or {@code null} if the directory containing the default SDK cannot
-   * be determined (or does not exist).
-   * <p>
-   * Added in order to test AnalysisContextImpl2.
-   * 
-   * @return the default Dart SDK
-   */
-  public static DirectoryBasedDartSdk getDefaultSdk2() {
-    File sdkDirectory = getDefaultSdkDirectory();
-    if (sdkDirectory == null) {
-      return null;
-    }
-    return new DirectoryBasedDartSdk(sdkDirectory, true);
-  }
-
-  /**
    * Return the default directory for the Dart SDK, or {@code null} if the directory cannot be
    * determined (or does not exist). The default directory is provided by a {@link System} property
    * named {@code com.google.dart.sdk}, or, if the property is not defined, an environment variable
    * named {@code DART_SDK}.
    * 
    * @return the default directory for the Dart SDK
    */
   public static File getDefaultSdkDirectory() {
     String sdkProperty = System.getProperty(DEFAULT_DIRECTORY_PROPERTY_NAME);
     if (sdkProperty == null) {
@@ skipping 296 matching lines @@
 
   /**
    * Initialize the state of the SDK.
    */
   private void initializeSdk() {
     if (!OSUtilities.isWindows()) {
       ensureVmIsExecutable();
     }
   }
 }