Log a warning if we try to load a URL longer than kMaxURLChars.

content/browser/web_contents/web_contents_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 1745 matching lines @@
                     DidDetachInterstitialPage());
 }
 
 bool WebContentsImpl::NavigateToEntry(
     const NavigationEntryImpl& entry,
     NavigationController::ReloadType reload_type) {
   TRACE_EVENT0("browser", "WebContentsImpl::NavigateToEntry");
 
   // The renderer will reject IPC messages with URLs longer than
   // this limit, so don't attempt to navigate with a longer URL.
-  if (entry.GetURL().spec().size() > kMaxURLChars)
+  if (entry.GetURL().spec().size() > kMaxURLChars) {
+    LOG(WARNING) << "Refusing to load URL as it exceeds " << kMaxURLChars
+                 << " characters.";
     return false;
+  }
 
   RenderViewHostImpl* dest_render_view_host =
       static_cast<RenderViewHostImpl*>(render_manager_.Navigate(entry));
   if (!dest_render_view_host)
     return false;  // Unable to create the desired render view host.
 
   // For security, we should never send non-Web-UI URLs to a Web UI renderer.
   // Double check that here.
   int enabled_bindings = dest_render_view_host->GetEnabledBindings();
   bool data_urls_allowed = delegate_ && delegate_->CanLoadDataURLsInWebUI();
@@ skipping 2012 matching lines @@
 gfx::Size WebContentsImpl::GetSizeForNewRenderView() const {
   gfx::Size size;
   if (delegate_)
     size = delegate_->GetSizeForNewRenderView(this);
   if (size.IsEmpty())
     size = view_->GetContainerSize();
   return size;
 }
 
 }  // namespace content