Don't call NP_Shutdown in FreePluginLibraryTask if the library has already been reloaded.

webkit/tools/test_shell/plugin_tests.cc

Index: webkit/tools/test_shell/plugin_tests.cc
===================================================================
--- webkit/tools/test_shell/plugin_tests.cc	(revision 66158)
+++ webkit/tools/test_shell/plugin_tests.cc	(working copy)
@@ -127,7 +127,7 @@
 // don't crash.
 TEST_F(PluginTest, DeleteFrameDuringEvent) {
   FilePath test_html = data_dir_;
-  test_html = test_html.AppendASCII("plugins");
+  test_html = test_html.AppendASCII(TEST_PLUGIN_DIRECTORY);
   test_html = test_html.AppendASCII("delete_frame.html");
   test_shell_->LoadFile(test_html);
   test_shell_->WaitTestFinished();
@@ -142,6 +142,17 @@
   // No crash means we passed.
 }
 
+// Tests that a forced reload of the plugin will not crash.
+TEST_F(PluginTest, ForceReload) {
+  FilePath test_html = data_dir_;
+  test_html = test_html.AppendASCII(TEST_PLUGIN_DIRECTORY);
+  test_html = test_html.AppendASCII("force_reload.html");
+  test_shell_->LoadFile(test_html);
+  test_shell_->WaitTestFinished();
+
+  // No crash means we passed.
+}
+
 #if defined(OS_WIN)
 BOOL CALLBACK EnumChildProc(HWND hwnd, LPARAM lparam) {
   HWND* plugin_hwnd = reinterpret_cast<HWND*>(lparam);
@@ -157,7 +168,7 @@
 // Tests that hiding/showing the parent frame hides/shows the plugin.
 TEST_F(PluginTest, PluginVisibilty) {
   FilePath test_html = data_dir_;
-  test_html = test_html.AppendASCII("plugins");
+  test_html = test_html.AppendASCII(TEST_PLUGIN_DIRECTORY);
   test_html = test_html.AppendASCII("plugin_visibility.html");
   test_shell_->LoadFile(test_html);
   test_shell_->WaitTestFinished();