Use precaching for more data: urls than just images.

Source/core/loader/FrameFetchContext.cpp

Index: Source/core/loader/FrameFetchContext.cpp
diff --git a/Source/core/loader/FrameFetchContext.cpp b/Source/core/loader/FrameFetchContext.cpp
index 8c9670f5c8ad37f47aa60d6caee77bc94f296102..c0771e70b85666694be354ca9f2b1dec1e7cef9a 100644
--- a/Source/core/loader/FrameFetchContext.cpp
+++ b/Source/core/loader/FrameFetchContext.cpp
@@ -540,11 +540,6 @@ bool FrameFetchContext::isMainFrame() const
     return frame()->isMainFrame();
 }
 
-bool FrameFetchContext::hasSubstituteData() const
-{
-    return m_documentLoader && m_documentLoader->substituteData().isValid();
-}
-
 bool FrameFetchContext::defersLoading() const
 {
     return frame()->page()->defersLoading();