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 64da9e9c7e85cfa62458071f3504d6137949db7d..82a6013699c06b7b5e3a5f1323c41479966a1cde 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.h
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.h
@@ -4012,13 +4012,12 @@ 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());
 }