Remove willRequestResource callback, it is unused outside of tests.

Source/web/FrameLoaderClientImpl.cpp

Index: Source/web/FrameLoaderClientImpl.cpp
diff --git a/Source/web/FrameLoaderClientImpl.cpp b/Source/web/FrameLoaderClientImpl.cpp
index 321f500af9d41cd07d20af128fedbb766524105f..56b861c1e761e5621da540a81f47a05ad8a60c72 100644
--- a/Source/web/FrameLoaderClientImpl.cpp
+++ b/Source/web/FrameLoaderClientImpl.cpp
@@ -77,7 +77,6 @@
 #include "public/platform/WebURLError.h"
 #include "public/platform/WebVector.h"
 #include "public/web/WebAutofillClient.h"
-#include "public/web/WebCachedURLRequest.h"
 #include "public/web/WebContentSettingsClient.h"
 #include "public/web/WebDOMEvent.h"
 #include "public/web/WebDocument.h"
@@ -556,14 +555,6 @@ NavigationPolicy FrameLoaderClientImpl::decidePolicyForNavigation(const Resource
     return static_cast<NavigationPolicy>(webPolicy);
 }
 
-void FrameLoaderClientImpl::dispatchWillRequestResource(FetchRequest* request)
-{
-    if (m_webFrame->client()) {
-        WebCachedURLRequest urlRequest(request);
-        m_webFrame->client()->willRequestResource(m_webFrame, urlRequest);
-    }
-}
-
 void FrameLoaderClientImpl::dispatchWillSendSubmitEvent(HTMLFormElement* form)
 {
     if (m_webFrame->client())