Content Shell: Drop an unused method.

ShellDevToolsFrontend::RenderProcessGone's functionality is now entirely
contained in LayoutTestDevToolsFrontend; I should have removed this
definition in https://codereview.chromium.org/644723002.

BUG=420994

Review URL: https://codereview.chromium.org/644963002

Cr-Commit-Position: refs/heads/master@{#299081}

content/shell/browser/shell_devtools_frontend.cc

@@ -92,11 +92,6 @@ void ShellDevToolsFrontend::WebContentsDestroyed() {
   delete this;
 }
 
-void ShellDevToolsFrontend::RenderProcessGone(base::TerminationStatus status) {
-  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kDumpRenderTree))
-    WebKitTestController::Get()->DevToolsProcessCrashed();
-}
-
 void ShellDevToolsFrontend::HandleMessageFromDevToolsFrontend(
     const std::string& message) {
   std::string method;

content/shell/browser/shell_devtools_frontend.h

@@ -41,7 +41,6 @@ class ShellDevToolsFrontend : public WebContentsObserver,
   virtual void RenderViewCreated(RenderViewHost* render_view_host) override;
   virtual void DocumentOnLoadCompletedInMainFrame() override;
   virtual void WebContentsDestroyed() override;
-  virtual void RenderProcessGone(base::TerminationStatus status) override;
 
   // content::DevToolsFrontendHost::Delegate implementation.
   virtual void HandleMessageFromDevToolsFrontend(