Remove CompilerCancelledException.

dart/pkg/compiler/lib/src/compiler.dart

Index: dart/pkg/compiler/lib/src/compiler.dart
diff --git a/dart/pkg/compiler/lib/src/compiler.dart b/dart/pkg/compiler/lib/src/compiler.dart
index 1d31f07dd370437a01102674a56e5ccfa485e8be..c6fc23abdec20b5e700f67a43c99cc5172fead9e 100644
--- a/dart/pkg/compiler/lib/src/compiler.dart
+++ b/dart/pkg/compiler/lib/src/compiler.dart
@@ -752,10 +752,6 @@ abstract class Compiler implements DiagnosticListener {
 
   bool disableInlining = false;
 
-  /// True if compilation was aborted with a [CompilerCancelledException]. Only
-  /// set after Future retuned by [run] has completed.
-  bool compilerWasCancelled = false;
-
   List<Uri> librariesToAnalyzeWhenRun;
 
   Tracer tracer;
@@ -866,8 +862,6 @@ abstract class Compiler implements DiagnosticListener {
       }
       hasCrashed = true;
       rethrow;
-    } on CompilerCancelledException catch (ex) {
-      rethrow;
     } on StackOverflowError catch (ex) {
       // We cannot report anything useful in this case, because we
       // do not have enough stack space.
@@ -1162,12 +1156,6 @@ abstract class Compiler implements DiagnosticListener {
     totalCompileTime.start();
 
     return new Future.sync(() => runCompiler(uri)).catchError((error) {
-      if (error is CompilerCancelledException) {
-        compilerWasCancelled = true;
-        log('Error: $error');
-        return false;
-      }
-
       try {
         if (!hasCrashed) {
           hasCrashed = true;
@@ -2129,21 +2117,6 @@ class CompilerTask {
   }
 }
 
-/// Don't throw this error. It immediately aborts the compiler which causes the
-/// following problems:
-///
-/// 1. No further errors and warnings are reported.
-/// 2. Breaks incremental compilation.
-class CompilerCancelledException extends Error {
-  final String reason;
-  CompilerCancelledException(this.reason);
-
-  String toString() {
-    String banner = 'compiler cancelled';
-    return (reason != null) ? '$banner: $reason' : '$banner';
-  }
-}
-
 class SourceSpan implements Spannable {
   final Uri uri;
   final int begin;