Port WebKit r43831 to 172....

third_party/WebKit/WebCore/loader/FrameLoader.cpp

Index: third_party/WebKit/WebCore/loader/FrameLoader.cpp
===================================================================
--- third_party/WebKit/WebCore/loader/FrameLoader.cpp	(revision 18687)
+++ third_party/WebKit/WebCore/loader/FrameLoader.cpp	(working copy)
@@ -3202,10 +3202,12 @@
 {
     if (m_isComplete)
         return CachePolicyVerify;
-    
+
+    // FIXME: This will return CachePolicyReload for any subresource of a document resulting from a POST request,
+    // making WebCore cache malfunction for such documents (see DocLoader::checkForReload()).
     if (m_loadType == FrameLoadTypeReloadFromOrigin || documentLoader()->request().cachePolicy() == ReloadIgnoringCacheData)
         return CachePolicyReload;
-    
+
     if (Frame* parentFrame = m_frame->tree()->parent()) {
         CachePolicy parentCachePolicy = parentFrame->loader()->cachePolicy();
         if (parentCachePolicy != CachePolicyVerify)