Don't load "sample.pdf" on Mac now since it's a known crash.

chrome/test/plugin/pdf_browsertest.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "app/clipboard/clipboard.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
@@ skipping 282 matching lines @@
 
   file_util::FileEnumerator file_enumerator(
       ui_test_utils::GetTestFilePath(GetPDFTestDir(), FilePath()),
       false,
       file_util::FileEnumerator::FILES,
       FILE_PATH_LITERAL("*.pdf"));
   for (FilePath file_path = file_enumerator.Next();
        !file_path.empty();
        file_path = file_enumerator.Next()) {
     std::string filename = WideToASCII(file_path.BaseName().ToWStringHack());
+
+#if defined(OS_MACOSX)
+    if (filename == "sample.pdf")
+      continue;  // Crashes on Mac.  http://crbug.com/63549
+#endif
+
     LOG(WARNING) << "PDFBrowserTest.Loading: " << filename;
 
     GURL url = test_server()->GetURL(base_url + filename);
     ui_test_utils::NavigateToURL(browser(), url);
 
     while (true) {
       int last_count = load_stop_notification_count();
       // We might get extraneous NotificationType::LOAD_STOP notifications when
       // doing async loading.  This happens when the first loader is cancelled
       // and before creating a byte-range request loader.
       bool complete = false;
       ASSERT_TRUE(ui_test_utils::ExecuteJavaScriptAndExtractBool(
           browser()->GetSelectedTabContents()->render_view_host(),
           std::wstring(),
           L"window.domAutomationController.send(plugin.documentLoadComplete())",
           &complete));
       if (complete)
         break;
 
       // Check if the LOAD_STOP notification could have come while we run a
       // nested message loop for the JS call.
       if (last_count != load_stop_notification_count())
         continue;
       ui_test_utils::WaitForLoadStop(controller);
     }
   }
 }
 
 }  // namespace