(Concept patch) Simplify WTF::HashTable::add() return value for size and performance

Source/core/rendering/RenderBlockLineLayout.cpp

Index: Source/core/rendering/RenderBlockLineLayout.cpp
diff --git a/Source/core/rendering/RenderBlockLineLayout.cpp b/Source/core/rendering/RenderBlockLineLayout.cpp
index e78d727a324e30d0b52aa7ebab7d4bfb9913602b..e2a96ebafc51851c7b8727eb57c893b93615bb6b 100644
--- a/Source/core/rendering/RenderBlockLineLayout.cpp
+++ b/Source/core/rendering/RenderBlockLineLayout.cpp
@@ -487,14 +487,14 @@ static inline void setLogicalWidthForTextRun(RootInlineBox* lineBox, BidiRun* ru
     run->m_box->setLogicalWidth(measuredWidth + hyphenWidth);
     if (!fallbackFonts.isEmpty()) {
         ASSERT(run->m_box->isText());
-        GlyphOverflowAndFallbackFontsMap::iterator it = textBoxDataMap.add(toInlineTextBox(run->m_box), make_pair(Vector<const SimpleFontData*>(), GlyphOverflow())).iterator;
+        GlyphOverflowAndFallbackFontsMap::ValueType* it = textBoxDataMap.add(toInlineTextBox(run->m_box), make_pair(Vector<const SimpleFontData*>(), GlyphOverflow())).iterator;
         ASSERT(it->value.first.isEmpty());
         copyToVector(fallbackFonts, it->value.first);
         run->m_box->parent()->clearDescendantsHaveSameLineHeightAndBaseline();
     }
     if ((glyphOverflow.top || glyphOverflow.bottom || glyphOverflow.left || glyphOverflow.right)) {
         ASSERT(run->m_box->isText());
-        GlyphOverflowAndFallbackFontsMap::iterator it = textBoxDataMap.add(toInlineTextBox(run->m_box), make_pair(Vector<const SimpleFontData*>(), GlyphOverflow())).iterator;
+        GlyphOverflowAndFallbackFontsMap::ValueType* it = textBoxDataMap.add(toInlineTextBox(run->m_box), make_pair(Vector<const SimpleFontData*>(), GlyphOverflow())).iterator;
         it->value.second = glyphOverflow;
         run->m_box->clearKnownToHaveNoOverflow();
     }