Isolate ExternalProtocolHandlerTest from other tests in the TearDown method.

chrome/browser/external_protocol/external_protocol_handler_unittest.cc

Index: chrome/browser/external_protocol/external_protocol_handler_unittest.cc
diff --git a/chrome/browser/external_protocol/external_protocol_handler_unittest.cc b/chrome/browser/external_protocol/external_protocol_handler_unittest.cc
index 74bb85692b67611103c8f81abdd9ce5e517e09cb..7fea9a06facaaf00ef23f15fd6acc3bc740fcd56 100644
--- a/chrome/browser/external_protocol/external_protocol_handler_unittest.cc
+++ b/chrome/browser/external_protocol/external_protocol_handler_unittest.cc
@@ -102,6 +102,11 @@ class ExternalProtocolHandlerTest : public testing::Test {
     file_thread_.Start();
   }
 
+  virtual void TearDown() {
+    // Ensure that g_accept_requests gets set back to true after test execution.
+    ExternalProtocolHandler::PermitLaunchUrl();
+  }
+
   void DoTest(ExternalProtocolHandler::BlockState block_state,
               ShellIntegration::DefaultWebClientState os_state,
               bool should_prompt, bool should_launch, bool should_block) {