Move LayoutDeprecatedFlexibleBox-specific line handling.

third_party/WebKit/Source/core/layout/LayoutBlock.h

Index: third_party/WebKit/Source/core/layout/LayoutBlock.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutBlock.h b/third_party/WebKit/Source/core/layout/LayoutBlock.h
index 120557d2e2725ba29af2de2400e9ba0d94d37b4f..b7ea8a672e64162113121173754667176d4f3a19 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBlock.h
+++ b/third_party/WebKit/Source/core/layout/LayoutBlock.h
@@ -209,12 +209,6 @@ public:
 
     LayoutRect logicalRectToPhysicalRect(const LayoutPoint& physicalPosition, const LayoutRect& logicalRect) const;
 
-    // Helper methods for computing line counts and heights for line counts.
-    RootInlineBox* lineAtIndex(int) const;
-    int lineCount(const RootInlineBox* = nullptr, bool* = nullptr) const;
-    int heightForLineCount(int lineCount);
-    void clearTruncation();
-
     LayoutBoxModelObject* virtualContinuation() const final { return continuation(); }
     bool isAnonymousBlockContinuation() const { return continuation() && isAnonymousBlock(); }
     LayoutInline* inlineElementContinuation() const;