Remove 'const' prefix from functions that return BorderValue by value.

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

Index: third_party/WebKit/Source/core/style/ComputedStyle.cpp
diff --git a/third_party/WebKit/Source/core/style/ComputedStyle.cpp b/third_party/WebKit/Source/core/style/ComputedStyle.cpp
index fe7f6757639aeefc7286610dcb53bde9e30cd9e2..e9dff7158b77016f83ec7dea5d537f78d591a8fd 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.cpp
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.cpp
@@ -2231,7 +2231,7 @@ Color ComputedStyle::VisitedDependentColor(int color_property) const {
                unvisited_color.Alpha());
 }
 
-const BorderValue ComputedStyle::BorderBefore() const {
+BorderValue ComputedStyle::BorderBefore() const {
   switch (GetWritingMode()) {
     case WritingMode::kHorizontalTb:
       return BorderTop();
@@ -2244,7 +2244,7 @@ const BorderValue ComputedStyle::BorderBefore() const {
   return BorderTop();
 }
 
-const BorderValue ComputedStyle::BorderAfter() const {
+BorderValue ComputedStyle::BorderAfter() const {
   switch (GetWritingMode()) {
     case WritingMode::kHorizontalTb:
       return BorderBottom();
@@ -2257,13 +2257,13 @@ const BorderValue ComputedStyle::BorderAfter() const {
   return BorderBottom();
 }
 
-const BorderValue ComputedStyle::BorderStart() const {
+BorderValue ComputedStyle::BorderStart() const {
   if (IsHorizontalWritingMode())
     return IsLeftToRightDirection() ? BorderLeft() : BorderRight();
   return IsLeftToRightDirection() ? BorderTop() : BorderBottom();
 }
 
-const BorderValue ComputedStyle::BorderEnd() const {
+BorderValue ComputedStyle::BorderEnd() const {
   if (IsHorizontalWritingMode())
     return IsLeftToRightDirection() ? BorderRight() : BorderLeft();
   return IsLeftToRightDirection() ? BorderBottom() : BorderTop();