Drop InvalidationSetMode.

Source/core/css/invalidation/DescendantInvalidationSet.cpp

Index: Source/core/css/invalidation/DescendantInvalidationSet.cpp
diff --git a/Source/core/css/invalidation/DescendantInvalidationSet.cpp b/Source/core/css/invalidation/DescendantInvalidationSet.cpp
index 232f3cfe9b14348d607baf9ee7162d9ea459874d..0dce99f2c571fb0e4cc10fcc504905c3b455e3e1 100644
--- a/Source/core/css/invalidation/DescendantInvalidationSet.cpp
+++ b/Source/core/css/invalidation/DescendantInvalidationSet.cpp
@@ -40,6 +40,7 @@ DescendantInvalidationSet::DescendantInvalidationSet()
     : m_allDescendantsMightBeInvalid(false)
     , m_customPseudoInvalid(false)
     , m_treeBoundaryCrossing(false)
+    , m_insertionPointCrossing(false)
 {
 }
 
@@ -89,6 +90,9 @@ void DescendantInvalidationSet::combine(const DescendantInvalidationSet& other)
     if (other.treeBoundaryCrossing())
         setTreeBoundaryCrossing();
 
+    if (other.insertionPointCrossing())
+        setInsertionPointCrossing();
+
     if (other.m_classes) {
         WillBeHeapHashSet<AtomicString>::const_iterator end = other.m_classes->end();
         for (WillBeHeapHashSet<AtomicString>::const_iterator it = other.m_classes->begin(); it != end; ++it)
@@ -177,6 +181,7 @@ void DescendantInvalidationSet::setWholeSubtreeInvalid()
 
     m_allDescendantsMightBeInvalid = true;
     m_treeBoundaryCrossing = false;
+    m_insertionPointCrossing = false;
     m_classes = nullptr;
     m_ids = nullptr;
     m_tagNames = nullptr;
@@ -203,6 +208,8 @@ void DescendantInvalidationSet::show() const
         fprintf(stderr, "::custom ");
     if (m_treeBoundaryCrossing)
         fprintf(stderr, "::shadow/deep/ ");
+    if (m_insertionPointCrossing)
+        fprintf(stderr, "::content/:host-context ");
     if (m_ids) {
         for (WillBeHeapHashSet<AtomicString>::const_iterator it = m_ids->begin(); it != m_ids->end(); ++it)
             fprintf(stderr, "#%s ", (*it).ascii().data());