Make pause-on-exceptions toggle/tri-state button.

Source/devtools/front_end/sourcesPanel.css

Index: Source/devtools/front_end/sourcesPanel.css
diff --git a/Source/devtools/front_end/sourcesPanel.css b/Source/devtools/front_end/sourcesPanel.css
index f427df1961a1b85c5da9e77bb234a7f20910be93..30b3e8dbee2542d8d0e0a58539b1c74c055eb131 100644
--- a/Source/devtools/front_end/sourcesPanel.css
+++ b/Source/devtools/front_end/sourcesPanel.css
@@ -31,11 +31,11 @@
     -webkit-mask-position: -256px 0;
 }
 
-.scripts-pause-on-exceptions-status-bar-item.toggled-all .glyph {
+.scripts-pause-on-exceptions-status-bar-item.toggled-uncaught .glyph {
     background-color: rgb(66, 129, 235);
 }
 
-.scripts-pause-on-exceptions-status-bar-item.toggled-uncaught .glyph {
+.scripts-pause-on-exceptions-status-bar-item.toggled-all .glyph {
     background-color: purple;
 }