Remove Expect from core library.

tools/testing/dart/status_expression.dart

Index: tools/testing/dart/status_expression.dart
diff --git a/tools/testing/dart/status_expression.dart b/tools/testing/dart/status_expression.dart
index 2ac072a0534198dd5b3e83dce711ed697b0881a2..934ce59d200fead3061435973737cf46413bab4f 100644
--- a/tools/testing/dart/status_expression.dart
+++ b/tools/testing/dart/status_expression.dart
@@ -229,13 +229,16 @@ class ExpressionParser {
     if (scanner.current == Token.LEFT_PAREN) {
       scanner.advance();
       SetExpression value = parseSetExpression();
-      Expect.equals(scanner.current, Token.RIGHT_PAREN,
-                    "Missing right parenthesis in expression");
+      if (scanner.current != Token.RIGHT_PAREN) {
+        throw new RuntimeError("Missing right parenthesis in expression");
+      }
       scanner.advance();
       return value;
     }
-    Expect.isTrue(new RegExp(r"^\w+$").hasMatch(scanner.current),
-                  "Expected identifier in expression, got ${scanner.current}");
+    if (!new RegExp(r"^\w+$").hasMatch(scanner.current)) {
+      throw new RuntimeError(
+          "Expected identifier in expression, got ${scanner.current}");
+    }
     SetExpression value = new SetConstant(scanner.current);
     scanner.advance();
     return value;
@@ -267,25 +270,32 @@ class ExpressionParser {
     if (scanner.current == Token.LEFT_PAREN) {
       scanner.advance();
       BooleanExpression value = parseBooleanExpression();
-      Expect.equals(scanner.current, Token.RIGHT_PAREN,
-                    "Missing right parenthesis in expression");
+      if (scanner.current != Token.RIGHT_PAREN) {
+        throw new RuntimeError("Missing right parenthesis in expression");
+      }
       scanner.advance();
       return value;
     }
 
     // The only atomic booleans are of the form $variable == value or the
     // form $variable.
-    Expect.equals(scanner.current, Token.DOLLAR_SYMBOL,
-        "Expected \$ in expression, got ${scanner.current}");
+    if (scanner.current != Token.DOLLAR_SYMBOL) {
+      throw new RuntimeError(
+          "Expected \$ in expression, got ${scanner.current}");
+    }
     scanner.advance();
-    Expect.isTrue(new RegExp(r"^\w+$").hasMatch(scanner.current),
-        "Expected identifier in expression, got ${scanner.current}");
+    if (!new RegExp(r"^\w+$").hasMatch(scanner.current)) {
+      throw new RuntimeError(
+          "Expected identifier in expression, got ${scanner.current}");
+    }
     TermVariable left = new TermVariable(scanner.current);
     scanner.advance();
     if (scanner.current == Token.EQUALS) {
       scanner.advance();
-      Expect.isTrue(new RegExp(r"^\w+$").hasMatch(scanner.current),
-          "Expected identifier in expression, got ${scanner.current}");
+      if (!new RegExp(r"^\w+$").hasMatch(scanner.current)) {
+        throw new RuntimeError(
+            "Expected identifier in expression, got ${scanner.current}");
+      }
       TermConstant right = new TermConstant(scanner.current);
       scanner.advance();
       return new Comparison(left, right);