Migrate WTF::HashSet::add() to ::insert() [part 1 of N]

third_party/WebKit/Source/platform/fonts/FontFallbackIterator.cpp

Index: third_party/WebKit/Source/platform/fonts/FontFallbackIterator.cpp
diff --git a/third_party/WebKit/Source/platform/fonts/FontFallbackIterator.cpp b/third_party/WebKit/Source/platform/fonts/FontFallbackIterator.cpp
index bd621c954b860d174ef977586c3623fc0bc68859..d082f33aa764c583cdaf11af16b16792407a60d0 100644
--- a/third_party/WebKit/Source/platform/fonts/FontFallbackIterator.cpp
+++ b/third_party/WebKit/Source/platform/fonts/FontFallbackIterator.cpp
@@ -78,7 +78,7 @@ PassRefPtr<FontDataForRangeSet> FontFallbackIterator::uniqueOrNext(
   // We don't want to skip subsetted ranges because HarfBuzzShaper's behavior
   // depends on the subsetting.
   if (candidate->isEntireRange())
-    m_uniqueFontDataForRangeSetsReturned.add(candidateId);
+    m_uniqueFontDataForRangeSetsReturned.insert(candidateId);
   return candidate;
 }
 
@@ -234,7 +234,7 @@ PassRefPtr<SimpleFontData> FontFallbackIterator::uniqueSystemFontForHintList(
 
   if (!hint || m_previouslyAskedForHint.contains(hint))
     return nullptr;
-  m_previouslyAskedForHint.add(hint);
+  m_previouslyAskedForHint.insert(hint);
   return fontCache->fallbackFontForCharacter(
       m_fontDescription, hint,
       m_fontFallbackList->primarySimpleFontData(m_fontDescription));