Removes dartc reliance on its own libraries, now can be targeted at any implementation's libraries

compiler/java/com/google/dart/compiler/SystemLibrary.java

Index: compiler/java/com/google/dart/compiler/SystemLibrary.java
diff --git a/compiler/java/com/google/dart/compiler/SystemLibrary.java b/compiler/java/com/google/dart/compiler/SystemLibrary.java
index ad37ceaca95b3429391784cacb0197c851858d9a..f1635c8d64d876908127feaa9243fce1b5a868e7 100644
--- a/compiler/java/com/google/dart/compiler/SystemLibrary.java
+++ b/compiler/java/com/google/dart/compiler/SystemLibrary.java
@@ -6,35 +6,33 @@ package com.google.dart.compiler;
 
 import java.io.File;
 import java.net.URI;
-import java.net.URISyntaxException;
 
 /**
- * A library accessible via the "dart:<libname>.lib" protocol.
+ * A library accessible via the "dart:<libname>" protocol.
  */
 public class SystemLibrary {
 
   private final String shortName;
   private final String host;
   private final String pathToLib;
-  private final File dirOrZip;
+  private final File dir;
 
   /**
    * Define a new system library such that dart:[shortLibName] will automatically be expanded to
    * dart://[host]/[pathToLib]. For example this call
    *
    * <pre>
-   *    new SystemLibrary("dom.lib", "dom", "dart_dom.lib");
+   *    new SystemLibrary("dom", "dom", "dom.dart");
    * </pre>
    *
    * will define a new system library such that "dart:dom.lib" to automatically be expanded to
-   * "dart://dom/dart_dom.lib". The dirOrZip argument is either the root directory or a zip file
-   * containing all files for this library.
+   * "dart://dom/dom.dart".
    */
-  public SystemLibrary(String shortName, String host, String pathToLib, File dirOrZip) {
+  public SystemLibrary(String shortName, String host, String pathToLib) {
     this.shortName = shortName;
     this.host = host;
     this.pathToLib = pathToLib;
-    this.dirOrZip = dirOrZip;
+    this.dir = new File(this.pathToLib).getParentFile();
   }
 
   public String getHost() {
@@ -50,22 +48,12 @@ public class SystemLibrary {
   }
 
   public URI translateUri(URI dartUri) {
-    if (!dirOrZip.exists()) {
-      throw new RuntimeException("System library for " + dartUri + " does not exist: " + dirOrZip.getPath());
-    }
-    try {
-      URI dirOrZipURI = dirOrZip.toURI();
-      if (dirOrZip.isFile()) {
-        return new URI("jar", "file:" + dirOrZipURI.getPath() + "!" + dartUri.getPath(), null);
-      } else {
-        return dirOrZipURI.resolve("." + dartUri.getPath());
-      }
-    } catch (URISyntaxException e) {
-      throw new AssertionError();
-    }
+
+    URI dirURI = dir.toURI();
+    return dirURI.resolve("." + dartUri.getPath());
   }
-  
+
   public File getFile() {
-    return this.dirOrZip;
+    return this.dir;
   }
 }