Remove GlyphOverflow.computeBounds as it's no longer used for -webkit-line-box-contain.

Source/core/layout/line/GlyphOverflow.h

Index: Source/core/layout/line/GlyphOverflow.h
diff --git a/Source/core/layout/line/GlyphOverflow.h b/Source/core/layout/line/GlyphOverflow.h
index 28c8005eada518c1e821143a88f3c6b32e6cb308..f13382f1327e7e476c88e6c15ee4440be7134370 100644
--- a/Source/core/layout/line/GlyphOverflow.h
+++ b/Source/core/layout/line/GlyphOverflow.h
@@ -27,7 +27,7 @@
 
 #include "platform/geometry/FloatRect.h"
 #include "wtf/Allocator.h"
-#include <math.h>
+#include <algorithm>
 
 namespace blink {
 
@@ -38,7 +38,6 @@ struct GlyphOverflow {
         , right(0)
         , top(0)
         , bottom(0)
-        , computeBounds(false)
     {
     }
 
@@ -49,21 +48,19 @@ struct GlyphOverflow {
 
     void setFromBounds(const FloatRect& bounds, float ascent, float descent, float textWidth)
     {
-        top = ceilf(computeBounds ? -bounds.y() : std::max(0.0f, -bounds.y() - ascent));
-        bottom = ceilf(computeBounds ? bounds.maxY() : std::max(0.0f, bounds.maxY() - descent));
+        top = ceilf(std::max(0.0f, -bounds.y() - ascent));
+        bottom = ceilf(std::max(0.0f, bounds.maxY() - descent));
         left = ceilf(std::max(0.0f, -bounds.x()));
         right = ceilf(std::max(0.0f, bounds.maxX() - textWidth));
     }
 
-    // If computeBounds, top and bottom are the maximum heights of the glyphs above and below the baseline, respectively.
-    // Otherwise they are the amounts of glyph overflows exceeding the font metrics' ascent and descent, respectively.
+    // Top and bottom are the amounts of glyph overflows exceeding the font metrics' ascent and descent, respectively.
     // Left and right are the amounts of glyph overflows exceeding the left and right edge of normal layout boundary, respectively.
     // All fields are in absolute number of pixels rounded up to the nearest integer.
     int left;
     int right;
     int top;
     int bottom;
-    bool computeBounds;
 };
 
 } // namespace blink