Remove -webkit-line-box-contain implementation.

Source/core/style/ComputedStyle.cpp

Index: Source/core/style/ComputedStyle.cpp
diff --git a/Source/core/style/ComputedStyle.cpp b/Source/core/style/ComputedStyle.cpp
index 342cd0056ccd950281007948e88379902baa3259..739ff8076e479bc25c6e072a6b41be9b39e1e3b5 100644
--- a/Source/core/style/ComputedStyle.cpp
+++ b/Source/core/style/ComputedStyle.cpp
@@ -540,7 +540,6 @@ bool ComputedStyle::diffNeedsFullLayoutAndPaintInvalidation(const ComputedStyle&
             || rareInheritedData->m_textOrientation != other.rareInheritedData->m_textOrientation
             || rareInheritedData->m_textCombine != other.rareInheritedData->m_textCombine
             || rareInheritedData->m_tabSize != other.rareInheritedData->m_tabSize
-            || rareInheritedData->m_lineBoxContain != other.rareInheritedData->m_lineBoxContain
             || rareInheritedData->listStyleImage != other.rareInheritedData->listStyleImage
             || rareInheritedData->textStrokeWidth != other.rareInheritedData->textStrokeWidth)
             return true;