Fix for issue 1351 - Analyzer accepts non-multiline strings with newlines

compiler/java/com/google/dart/compiler/parser/DartScanner.java

Index: compiler/java/com/google/dart/compiler/parser/DartScanner.java
diff --git a/compiler/java/com/google/dart/compiler/parser/DartScanner.java b/compiler/java/com/google/dart/compiler/parser/DartScanner.java
index e710149510e67e59db80fad5896d45b09ee62252..eef0f3b61343b6354acad9cb9cec0664f9dc4d8e 100644
--- a/compiler/java/com/google/dart/compiler/parser/DartScanner.java
+++ b/compiler/java/com/google/dart/compiler/parser/DartScanner.java
@@ -946,6 +946,14 @@ public class DartScanner {
         c = lookahead(0);
         advance();
         switch (c) {
+          case '\n':
+            if (!multiLine) {
+              // TODO(zundel): better way to report error?
+              internalState.resetModes();
+              return Token.ILLEGAL;
+            }
+            c = '\n';
+            break;
           case 'b':
             c = 0x08;
             break;