Revert of Add tab support to RenderBlockLineLayout::stripTrailingSpace

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 4eaf44250e35ec52ee3a842a786555e0bb3db519..b31f46799b50a31d90fbfbaf82731fc63da9c7c3 100644
--- a/Source/core/rendering/RenderBlockLineLayout.cpp
+++ b/Source/core/rendering/RenderBlockLineLayout.cpp
@@ -1164,28 +1164,17 @@
         child->borderStart();
 }
 
-static inline void stripTrailingSpace(float& inlineMax, float& inlineMin,
-    RenderObject* trailingSpaceChild)
+static inline void stripTrailingSpace(float& inlineMax, float& inlineMin, RenderObject* trailingSpaceChild)
 {
     if (trailingSpaceChild && trailingSpaceChild->isText()) {
-        // Collapse away the trailing space at the end of a block by finding
-        // the first white-space character and subtracting its width. Subsequent
-        // white-space characters have been collapsed into the first one (which
-        // can be either a space or a tab character).
+        // Collapse away the trailing space at the end of a block.
         RenderText* text = toRenderText(trailingSpaceChild);
-        UChar trailingWhitespaceChar = ' ';
-        for (unsigned i = text->textLength(); i > 0; i--) {
-            UChar c = text->characterAt(i - 1);
-            if (!Character::treatAsSpace(c))
-                break;
-            trailingWhitespaceChar = c;
-        }
-
-        // FIXME: This ignores first-line.
-        const Font& font = text->style()->font();
-        TextRun run = constructTextRun(text, font, &trailingWhitespaceChar, 1,
-            text->style(), text->style()->direction());
-        run.setUseComplexCodePath(!text->canUseSimpleFontCodePath());
+        bool useComplexCodePath = !text->canUseSimpleFontCodePath();
+        const UChar space = ' ';
+        const Font& font = text->style()->font(); // FIXME: This ignores first-line.
+        TextRun run = constructTextRun(text, font, &space, 1, text->style(), LTR);
+        if (useComplexCodePath)
+            run.setUseComplexCodePath(true);
         float spaceWidth = font.width(run);
         inlineMax -= spaceWidth + font.fontDescription().wordSpacing();
         if (inlineMin > inlineMax)