FontResourceTest: call unregisterURL() respectively

third_party/WebKit/public/platform/WebURLLoaderMockFactory.h

Index: third_party/WebKit/public/platform/WebURLLoaderMockFactory.h
diff --git a/third_party/WebKit/public/platform/WebURLLoaderMockFactory.h b/third_party/WebKit/public/platform/WebURLLoaderMockFactory.h
index 1e17c337b89e88e1828d46ead4ea25743e300ea0..b3cc9b16f918ec866ead8c913c0155fb77a24ad6 100644
--- a/third_party/WebKit/public/platform/WebURLLoaderMockFactory.h
+++ b/third_party/WebKit/public/platform/WebURLLoaderMockFactory.h
@@ -32,11 +32,15 @@ class WebURLLoaderMockFactory {
 
   // Registers a response and the file to be served when the specified URL
   // is loaded. If no file is specified then the response content will be empty.
+  // unregisterURL() should be called for each test entry before registering
+  // another response for the same URL from another test.
   virtual void registerURL(const WebURL&,
                            const WebURLResponse&,
                            const WebString& filePath) = 0;
 
   // Registers an error to be served when the specified URL is requested.
+  // unregisterURL() should be called for each test entry before registering
+  // another response for the same URL from another test.
   virtual void registerErrorURL(const WebURL&,
                                 const WebURLResponse&,
                                 const WebURLError&) = 0;