Revert of Disable support for swapped out RenderFrame(Host) and add instrumentation

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 149a4b2885d91e0064baa426d438575f8f930de0..081f0832fcadeb0e234088a01822491d8835df50 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -7,7 +7,6 @@
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/command_line.h"
-#include "base/debug/dump_without_crashing.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
@@ -1293,20 +1292,6 @@
 
 void RenderWidget::OnSetFocus(bool enable) {
   has_focus_ = enable;
-
-  // TODO(nasko): This code is here to help diagnose https://crbug.com/541578.
-  if (webwidget_->isWebView()) {
-    blink::WebView* view = static_cast<blink::WebView*>(webwidget_);
-    if (view->mainFrame()->isWebRemoteFrame()) {
-      blink::WebFrame* mainFrame = view->mainFrame();
-
-      base::debug::Alias(&mainFrame);
-      base::debug::Alias(&is_swapped_out_);
-
-      base::debug::DumpWithoutCrashing();
-    }
-  }
-
   if (webwidget_)
     webwidget_->setFocus(enable);
 }