[DevTools] Cleanup inspector overlay and make it work with virtual viewport.

Source/core/inspector/InspectorPageAgent.cpp

Index: Source/core/inspector/InspectorPageAgent.cpp
diff --git a/Source/core/inspector/InspectorPageAgent.cpp b/Source/core/inspector/InspectorPageAgent.cpp
index 913bf6b9ac4c0ba30dfc8985bbd1355eec03b7a8..2ab856b5726ac144d893f50a920142fc722f6636 100644
--- a/Source/core/inspector/InspectorPageAgent.cpp
+++ b/Source/core/inspector/InspectorPageAgent.cpp
@@ -398,12 +398,6 @@ void InspectorPageAgent::restore()
     }
 }
 
-void InspectorPageAgent::webViewResized(const IntSize& size)
-{
-    int currentWidth = static_cast<int>(m_state->getLong(PageAgentState::pageAgentScreenWidthOverride));
-    m_overlay->resize(currentWidth ? size : IntSize());
-}
-
 void InspectorPageAgent::enable(ErrorString*)
 {
     m_enabled = true;