[DevTools] Promote Device Mode v2 to default experiments.

third_party/WebKit/Source/devtools/front_end/ui/toolbar.css

Index: third_party/WebKit/Source/devtools/front_end/ui/toolbar.css
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/toolbar.css b/third_party/WebKit/Source/devtools/front_end/ui/toolbar.css
index 4720c2d8cdb5e72837f79ee968501d62aabe3247..97d0cfa2af525cdacf58c432fea80c71d649ef44 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/toolbar.css
+++ b/third_party/WebKit/Source/devtools/front_end/ui/toolbar.css
@@ -284,8 +284,14 @@ select.toolbar-item {
 }
 
 .emulation-toolbar-item .glyph {
+    -webkit-mask-position: -288px -144px;
+}
+
+@media (-webkit-min-device-pixel-ratio: 1.5) {
+.emulation-toolbar-item .glyph {
     -webkit-mask-position: -160px 0;
 }
+}
 
 .emulation-toolbar-item.warning::after {
     background-image: url(Images/toolbarButtonGlyphs.png);
@@ -551,8 +557,14 @@ button.playback-rate-button {
 }
 
 .desktop-toolbar-item .glyph {
+    -webkit-mask-position: -256px -144px;
+}
+
+@media (-webkit-min-device-pixel-ratio: 1.5) {
+.desktop-toolbar-item .glyph {
     -webkit-mask-position: -160px -144px;
 }
+}
 
 .rotate-screen-toolbar-item .glyph {
     -webkit-mask-position: -192px -144px;