Ensure zoom level is not updated if main frame is WebRemoteFrame.

third_party/WebKit/Source/web/WebViewImpl.cpp

Index: third_party/WebKit/Source/web/WebViewImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebViewImpl.cpp b/third_party/WebKit/Source/web/WebViewImpl.cpp
index 76068fbb2bda4ace2a37a61b45fb6c84dcc71eca..84b2d6e99c4f80901dd5e75d4a559ee70a662392 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.cpp
+++ b/third_party/WebKit/Source/web/WebViewImpl.cpp
@@ -3079,6 +3079,11 @@ double WebViewImpl::setZoomLevel(double zoomLevel)
     else
         m_zoomLevel = zoomLevel;
 
+    // TODO(nasko): Setting zoom level needs to be refactored to support
+    // out-of-process iframes. See https://crbug.com/528407.
+    if (mainFrame()->isWebRemoteFrame())
+        return m_zoomLevel;
+
     LocalFrame* frame = mainFrameImpl()->frame();
     if (!WebLocalFrameImpl::pluginContainerFromFrame(frame)) {
         float zoomFactor = m_zoomFactorOverride ? m_zoomFactorOverride : static_cast<float>(zoomLevelToZoomFactor(m_zoomLevel));