Limit optimized LayoutBlockFlowLine width computation to 8bit

third_party/WebKit/LayoutTests/platform/linux/fast/forms/select/menulist-appearance-rtl-expected.txt

Index: third_party/WebKit/LayoutTests/platform/linux/fast/forms/select/menulist-appearance-rtl-expected.txt
diff --git a/third_party/WebKit/LayoutTests/platform/linux/fast/forms/select/menulist-appearance-rtl-expected.txt b/third_party/WebKit/LayoutTests/platform/linux/fast/forms/select/menulist-appearance-rtl-expected.txt
index 0b3cac7cc8ac951488881da74d53f9b99a7801b6..42fe2cb565a709750a5dc93deda64ce1cc119fd8 100644
--- a/third_party/WebKit/LayoutTests/platform/linux/fast/forms/select/menulist-appearance-rtl-expected.txt
+++ b/third_party/WebKit/LayoutTests/platform/linux/fast/forms/select/menulist-appearance-rtl-expected.txt
@@ -64,8 +64,8 @@ layer at (0,0) size 800x567
         LayoutBlockFlow (anonymous) at (0,39) size 784x20
           LayoutMenuList {SELECT} at (0,0) size 113x20 [bgcolor=#C0C0C0] [border: (1px solid #A9A9A9)]
             LayoutBlockFlow (anonymous) at (1,1) size 111x18
-              LayoutText (anonymous) at (4,1) size 82x16
-                text run at (4,1) width 82 RTL: "\x{627}\x{644}\x{627}\x{642}\x{62A}\x{631}\x{627}\x{62D}\x{627}\x{62A} / \x{627}\x{644}\x{634}\x{643}\x{627}\x{648}\x{64A}"
+              LayoutText (anonymous) at (4,1) size 91x16
+                text run at (4,1) width 91 RTL: "\x{627}\x{644}\x{627}\x{642}\x{62A}\x{631}\x{627}\x{62D}\x{627}\x{62A} / \x{627}\x{644}\x{634}\x{643}\x{627}\x{648}\x{64A}"
           LayoutText {#text} at (0,0) size 0x0
       LayoutBlockFlow {HR} at (0,329) size 784x2 [border: (1px inset #EEEEEE)]
       LayoutBlockFlow {P} at (0,347) size 784x20