Dev Tools: Adjust Dev Tool Source panel show/hide sidebar icons

third_party/WebKit/Source/devtools/front_end/ui/Icon.js

Index: third_party/WebKit/Source/devtools/front_end/ui/Icon.js
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/Icon.js b/third_party/WebKit/Source/devtools/front_end/ui/Icon.js
index 667fe1853219abf8361609f117a19097c68577a8..fdf9579351b322d5ec7e512938b4ddec4af98acf 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/Icon.js
+++ b/third_party/WebKit/Source/devtools/front_end/ui/Icon.js
@@ -174,9 +174,9 @@ UI.Icon.Descriptors = {
   'largeicon-show-left-sidebar': {x: -160, y: -72, width: 28, height: 24, spritesheet: 'largeicons', isMask: true},
   'largeicon-hide-left-sidebar': {x: -192, y: -72, width: 28, height: 24, spritesheet: 'largeicons', isMask: true},
   'largeicon-show-right-sidebar':
-      {x: -160, y: -72, width: 28, height: 24, spritesheet: 'largeicons', isMask: true, transform: 'rotate(180deg)'},
+      {x: -160, y: -72, width: 28, height: 24, spritesheet: 'largeicons', isMask: true, transform: 'scaleX(-1)'},
   'largeicon-hide-right-sidebar':
-      {x: -192, y: -72, width: 28, height: 24, spritesheet: 'largeicons', isMask: true, transform: 'rotate(180deg)'},
+      {x: -192, y: -72, width: 28, height: 24, spritesheet: 'largeicons', isMask: true, transform: 'scaleX(-1)'},
   'largeicon-show-top-sidebar': {
     x: -160,
     y: -72,