[DevTools] Use device metrics emulation implemented in content.

Source/core/rendering/TextAutosizer.cpp

Index: Source/core/rendering/TextAutosizer.cpp
diff --git a/Source/core/rendering/TextAutosizer.cpp b/Source/core/rendering/TextAutosizer.cpp
index 50a5154b265da080066be623bc957902d3214bac..6e318161b885deb32be14968a6985945aa7f46a6 100644
--- a/Source/core/rendering/TextAutosizer.cpp
+++ b/Source/core/rendering/TextAutosizer.cpp
@@ -180,10 +180,8 @@ bool TextAutosizer::processSubtree(RenderObject* layoutRoot)
 
     // Window area, in logical (density-independent) pixels.
     windowInfo.windowSize = m_document->settings()->textAutosizingWindowSizeOverride();
-    if (windowInfo.windowSize.isEmpty()) {
-        bool includeScrollbars = !InspectorInstrumentation::shouldApplyScreenWidthOverride(mainFrame);
-        windowInfo.windowSize = mainFrame->view()->unscaledVisibleContentSize(includeScrollbars ? ScrollableArea::IncludeScrollbars : ScrollableArea::ExcludeScrollbars);
-    }
+    if (windowInfo.windowSize.isEmpty())
+        windowInfo.windowSize = mainFrame->view()->unscaledVisibleContentSize(ScrollableArea::IncludeScrollbars);
 
     // Largest area of block that can be visible at once (assuming the main
     // frame doesn't get scaled to less than overview scale), in CSS pixels.