Remove unused method upgradeInsecureRequest() from DocumentLoader

third_party/WebKit/Source/core/loader/DocumentLoader.h

Index: third_party/WebKit/Source/core/loader/DocumentLoader.h
diff --git a/third_party/WebKit/Source/core/loader/DocumentLoader.h b/third_party/WebKit/Source/core/loader/DocumentLoader.h
index fd1ebf460522b211bf40ca020dc6577b5f455fe7..868406129754abd335e367f6e281e9a6efdb03c9 100644
--- a/third_party/WebKit/Source/core/loader/DocumentLoader.h
+++ b/third_party/WebKit/Source/core/loader/DocumentLoader.h
@@ -135,8 +135,6 @@ class CORE_EXPORT DocumentLoader
     m_navigationType = navigationType;
   }
 
-  void upgradeInsecureRequest();
-
   void startLoadingMainResource();
 
   DocumentLoadTiming& timing() { return m_documentLoadTiming; }