Don't enable @viewport support in inspector emulation.

Source/web/DevToolsEmulator.cpp

 // Copyright 2015 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 "config.h"
 #include "web/DevToolsEmulator.h"
 
 #include "core/frame/FrameView.h"
 #include "core/frame/Settings.h"
 #include "core/page/Page.h"
@@ skipping 34 matching lines @@
 
 } // namespace
 
 namespace blink {
 
 DevToolsEmulator::DevToolsEmulator(WebViewImpl* webViewImpl)
     : m_webViewImpl(webViewImpl)
     , m_emulationAgent(nullptr)
     , m_deviceMetricsEnabled(false)
     , m_emulateMobileEnabled(false)
-    , m_originalViewportEnabled(false)
     , m_isOverlayScrollbarsEnabled(false)
     , m_originalDefaultMinimumPageScaleFactor(0)
     , m_originalDefaultMaximumPageScaleFactor(0)
     , m_embedderTextAutosizingEnabled(webViewImpl->page()->settings().textAutosizingEnabled())
     , m_embedderDeviceScaleAdjustment(webViewImpl->page()->settings().deviceScaleAdjustment())
     , m_embedderPreferCompositingToLCDTextEnabled(webViewImpl->page()->settings().preferCompositingToLCDTextEnabled())
     , m_embedderUseMobileViewport(webViewImpl->page()->settings().useMobileViewportStyle())
     , m_touchEventEmulationEnabled(false)
     , m_doubleTapToZoomEnabled(false)
     , m_originalTouchEnabled(false)
@@ skipping 109 matching lines @@
     }
 }
 
 void DevToolsEmulator::enableMobileEmulation()
 {
     if (m_emulateMobileEnabled)
         return;
     m_emulateMobileEnabled = true;
     m_isOverlayScrollbarsEnabled = RuntimeEnabledFeatures::overlayScrollbarsEnabled();
     RuntimeEnabledFeatures::setOverlayScrollbarsEnabled(true);
-    m_originalViewportEnabled = RuntimeEnabledFeatures::cssViewportEnabled();
-    RuntimeEnabledFeatures::setCSSViewportEnabled(true);
     m_webViewImpl->enableViewport();
     m_webViewImpl->settings()->setViewportMetaEnabled(true);
     m_webViewImpl->settings()->setShrinksViewportContentToFit(true);
     m_webViewImpl->page()->settings().setTextAutosizingEnabled(true);
     m_webViewImpl->page()->settings().setPreferCompositingToLCDTextEnabled(true);
     m_webViewImpl->page()->settings().setUseMobileViewportStyle(true);
     m_webViewImpl->setZoomFactorOverride(1);
 
     m_originalDefaultMinimumPageScaleFactor = m_webViewImpl->defaultMinimumPageScaleFactor();
     m_originalDefaultMaximumPageScaleFactor = m_webViewImpl->defaultMaximumPageScaleFactor();
     m_webViewImpl->setDefaultPageScaleLimits(0.25f, 5);
 }
 
 void DevToolsEmulator::disableMobileEmulation()
 {
     if (!m_emulateMobileEnabled)
         return;
     RuntimeEnabledFeatures::setOverlayScrollbarsEnabled(m_isOverlayScrollbarsEnabled);
-    RuntimeEnabledFeatures::setCSSViewportEnabled(m_originalViewportEnabled);
     m_webViewImpl->disableViewport();
     m_webViewImpl->settings()->setViewportMetaEnabled(false);
     m_webViewImpl->settings()->setShrinksViewportContentToFit(false);
     m_webViewImpl->page()->settings().setTextAutosizingEnabled(m_embedderTextAutosizingEnabled);
     m_webViewImpl->page()->settings().setPreferCompositingToLCDTextEnabled(m_embedderPreferCompositingToLCDTextEnabled);
     m_webViewImpl->page()->settings().setUseMobileViewportStyle(m_embedderUseMobileViewport);
     m_webViewImpl->setZoomFactorOverride(0);
     m_emulateMobileEnabled = false;
     m_webViewImpl->setDefaultPageScaleLimits(
         m_originalDefaultMinimumPageScaleFactor,
@@ skipping 56 matching lines @@
             m_lastPinchAnchorCss.clear();
             m_lastPinchAnchorDip.clear();
         }
         return true;
     }
 
     return false;
 }
 
 } // namespace blink