Revert "No longer OOM on invalid string length."

tools/lexer-shell.cc

Index: tools/lexer-shell.cc
diff --git a/tools/lexer-shell.cc b/tools/lexer-shell.cc
index e2e4a9c2521f55a4074214afe82492c2096d4031..8c7debcab8b1554fa6026cd8d7d283b213e87016 100644
--- a/tools/lexer-shell.cc
+++ b/tools/lexer-shell.cc
@@ -68,7 +68,6 @@ class BaselineScanner {
             Vector<const uint16_t>(
                 reinterpret_cast<const uint16_t*>(source_),
                 length / 2));
-        CHECK_NOT_EMPTY_HANDLE(isolate, result);
         stream_ =
             new GenericStringUtf16CharacterStream(result, 0, result->length());
         break;
@@ -76,7 +75,6 @@ class BaselineScanner {
       case LATIN1: {
         Handle<String> result = isolate->factory()->NewStringFromOneByte(
             Vector<const uint8_t>(source_, length));
-        CHECK_NOT_EMPTY_HANDLE(isolate, result);
         stream_ =
             new GenericStringUtf16CharacterStream(result, 0, result->length());
         break;