Change ComputedStyle::setWritingMode() to return void instead of bool

third_party/WebKit/Source/core/layout/LayoutObject.cpp

Index: third_party/WebKit/Source/core/layout/LayoutObject.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.cpp b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
index 49d84c9545ea0007d229625bf1ab2e2d56d56948..c9f0b62b777e14bb1239ecc5c2bcc147596ea1de 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
@@ -1953,8 +1953,11 @@ void LayoutObject::setStyleWithWritingModeOfParent(
 
 void LayoutObject::addChildWithWritingModeOfParent(LayoutObject* newChild,
                                                    LayoutObject* beforeChild) {
-  if (newChild->mutableStyleRef().setWritingMode(styleRef().getWritingMode()) &&
-      newChild->isBoxModelObject()) {
+  const WritingMode oldWritingMode =
+      newChild->mutableStyleRef().getWritingMode();
+  const WritingMode newWritingMode = styleRef().getWritingMode();
+  if (oldWritingMode != newWritingMode && newChild->isBoxModelObject()) {
+    newChild->mutableStyleRef().setWritingMode(newWritingMode);
     newChild->setHorizontalWritingMode(isHorizontalWritingMode());
   }
   addChild(newChild, beforeChild);