Valgrind: Fix a leak.

chrome/browser/extensions/api/identity/web_auth_flow_unittest.cc

Index: chrome/browser/extensions/api/identity/web_auth_flow_unittest.cc
diff --git a/chrome/browser/extensions/api/identity/web_auth_flow_unittest.cc b/chrome/browser/extensions/api/identity/web_auth_flow_unittest.cc
index cce0152a22efb5c5def8d6fb03e9cea1fc6d1106..11525476ac2a4709f34e4e14cbde5111a35bd3af 100644
--- a/chrome/browser/extensions/api/identity/web_auth_flow_unittest.cc
+++ b/chrome/browser/extensions/api/identity/web_auth_flow_unittest.cc
@@ -105,6 +105,14 @@ class WebAuthFlowTest : public ChromeRenderViewHostTestHarness {
     ChromeRenderViewHostTestHarness::SetUp();
   }
 
+  virtual void TearDown() {
+    // |flow_| must be reset before ChromeRenderViewHostTestHarness::TearDown(),
+    // because |flow_| deletes the WebContents it owns via
+    // MessageLoop::DeleteSoon().
+    flow_.reset();
+    ChromeRenderViewHostTestHarness::TearDown();
+  }
+
   void CreateAuthFlow(const std::string& extension_id, const GURL& url) {
     flow_.reset(new MockWebAuthFlow(&delegate_, profile(), extension_id, url));
   }