diff -ur qtwebengine-opensource-src-5.8.0/src/3rdparty/chromium/third_party/WebKit/Source/wtf/LinkedHashSet.h qtwebengine-opensource-src-5.8.0-wtf-gcc7/src/3rdparty/chromium/third_party/WebKit/Source/wtf/LinkedHashSet.h
--- qtwebengine-opensource-src-5.8.0/src/3rdparty/chromium/third_party/WebKit/Source/wtf/LinkedHashSet.h	2017-01-03 10:28:53.000000000 +0100
+++ qtwebengine-opensource-src-5.8.0-wtf-gcc7/src/3rdparty/chromium/third_party/WebKit/Source/wtf/LinkedHashSet.h	2017-03-07 03:00:44.783316233 +0100
@@ -542,6 +542,8 @@
     return *this;
 }
 
+inline void swapAnchor(LinkedHashSetNodeBase& a, LinkedHashSetNodeBase& b);
+
 template<typename T, typename U, typename V, typename W>
 inline void LinkedHashSet<T, U, V, W>::swap(LinkedHashSet& other)
 {