Add missing getTraceCategoryEnabledFlag() override.

Source/core/fetch/ResourceTest.cpp

Index: Source/core/fetch/ResourceTest.cpp
diff --git a/Source/core/fetch/ResourceTest.cpp b/Source/core/fetch/ResourceTest.cpp
index 84372390630c7d93e5190c63f14ce7ba93f2f7f6..6ad9f3c6921c7ab1b13bffe14e63ff3a902283fa 100644
--- a/Source/core/fetch/ResourceTest.cpp
+++ b/Source/core/fetch/ResourceTest.cpp
@@ -27,10 +27,6 @@ public:
     {
         m_cachedURLs.append(url);
     }
-    void cryptographicallyRandomValues(unsigned char* buffer, size_t length) override
-    {
-        ASSERT_NOT_REACHED();
-    }
 
     const Vector<WebURL>& cachedURLs() const
     {
@@ -42,6 +38,18 @@ public:
         return m_oldPlatform->currentThread();
     }
 
+    // These blink::Platform methods must be overriden to make a usable object.
+    void cryptographicallyRandomValues(unsigned char* buffer, size_t length) override
+    {
+        ASSERT_NOT_REACHED();
+    }
+
+    const unsigned char* getTraceCategoryEnabledFlag(const char* categoryName) override
+    {
+        static const unsigned char tracingIsDisabled = 0;
+        return &tracingIsDisabled;
+    }
+
 private:
     Platform* m_oldPlatform; // Not owned.
     Vector<WebURL> m_cachedURLs;