Have BidiRunList destructor delete runs

Source/platform/text/BidiResolverTest.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 222 matching lines @@
         for (size_t i = 0; i < expectedLevels.size(); i++) {
             // level == -1 means the level should be ignored.
             if (expectedLevels[i] == actualLevels[i] || expectedLevels[i] == -1)
                 continue;
 
             printf("LEVELS %s%s\n", diffString(actualLevels, expectedLevels).c_str(), errorContext.str().c_str());
             m_levelFailures++;
             break;
         }
     }
-    runs.deleteRuns();
 }
 
 
 TEST(BidiResolver, BidiTest_txt)
 {
     BidiTestRunner runner;
     // Blink's Unicode Bidi Algorithm (UBA) doesn't yet support the
     // new isolate directives from Unicode 6.3:
     // http://www.unicode.org/reports/tr9/#Explicit_Directional_Isolates
     runner.skipTestsWith(0x2066); // LRI
@@ skipping 31 matching lines @@
     // The unittest harness only pays attention to GTest output, so we verify
     // that the tests behaved as expected:
     EXPECT_EQ(352098u, runner.m_testsRun);
     EXPECT_EQ(418143u, runner.m_testsSkipped);
     EXPECT_EQ(0u, runner.m_ignoredCharFailures);
     EXPECT_EQ(44882u, runner.m_levelFailures);
     EXPECT_EQ(19151u, runner.m_orderFailures);
 }
 
 }