[ddc] Align error message with VM when reload is rejected

https://github.com/flutter/flutter/blob/f3d0f5a2ca422b1d8cbfc1c4d67ae288ce22ee47/packages/flutter_tools/lib/src/run_hot.dart#L1669

The above is emitted when a reload is rejected at runtime in
the VM. Since we reject errors at compile-time, we should align
the error messages.

Change-Id: I6687d3efaf87d1dce1c7d21591039cbb5a447ff1
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/413543
Commit-Queue: Johnni Winther <[email protected]>
Reviewed-by: Johnni Winther <[email protected]>
Reviewed-by: Nicholas Shahan <[email protected]>
Auto-Submit: Srujan Gaddam <[email protected]>

Author: srujzs

pkg/dev_compiler/lib/src/command/command.dart

@@ -369,7 +369,7 @@ Future<CompilerResult> _compile(List<String> args,
       if (rejectionReasons.isNotEmpty) {
         throw StateError(
             'Hot reload rejected due to:\n${rejectionReasons.join('\n')}\n'
-            'Use hot restart instead.');
+            'Try performing a hot restart instead.');
       }
     }
     var sink = File(reloadDeltaKernel).openWrite();

pkg/frontend_server/lib/src/javascript_bundle.dart

@@ -98,7 +98,7 @@ class IncrementalJavaScriptBundler {
       if (errors.isNotEmpty) {
         throw new Exception(errors.join('/n') +
             '\nHot reload rejected due to unsupported changes. '
-                'Use hot restart instead.');
+                'Try performing a hot restart instead.');
       }
     }
     _currentComponent = partialComponent;