Use float for scroll offset.

third_party/WebKit/Source/core/style/ComputedStyle.h

Index: third_party/WebKit/Source/core/style/ComputedStyle.h
diff --git a/third_party/WebKit/Source/core/style/ComputedStyle.h b/third_party/WebKit/Source/core/style/ComputedStyle.h
index fe586c81d8a6206e5948805791cbc87093c241d1..9cc5c8815f9737bd3baf0248cadb1c1e1ce4676b 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.h
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.h
@@ -4011,13 +4011,12 @@ inline LayoutUnit adjustLayoutUnitForAbsoluteZoom(LayoutUnit value,
   return LayoutUnit(value / style.effectiveZoom());
 }
 
-inline double adjustScrollForAbsoluteZoom(double scrollOffset,
-                                          float zoomFactor) {
+inline float adjustScrollForAbsoluteZoom(float scrollOffset, float zoomFactor) {
   return scrollOffset / zoomFactor;
 }
 
-inline double adjustScrollForAbsoluteZoom(double scrollOffset,
-                                          const ComputedStyle& style) {
+inline float adjustScrollForAbsoluteZoom(float scrollOffset,
+                                         const ComputedStyle& style) {
   return adjustScrollForAbsoluteZoom(scrollOffset, style.effectiveZoom());
 }