Revert of DevTools: Roll CodeMirror to 5.25.1

third_party/WebKit/Source/devtools/front_end/cm/overlay.js

 // CodeMirror, copyright (c) by Marijn Haverbeke and others
 // Distributed under an MIT license: http://codemirror.net/LICENSE
 
 // Utility function that allows modes to be combined. The mode given
 // as the base argument takes care of most of the normal mode
 // functionality, but a second (typically simple) mode is used, which
 // can override the style of text. Both modes get to parse all of the
 // text, but when both assign a non-null style to a piece of code, the
 // overlay wins, unless the combine argument was true and not overridden,
 // or state.overlay.combineTokens was true, in which case the styles are
@@ skipping 58 matching lines @@
     },
 
     indent: base.indent && function(state, textAfter) {
       return base.indent(state.base, textAfter);
     },
     electricChars: base.electricChars,
 
     innerMode: function(state) { return {state: state.base, mode: base}; },
 
     blankLine: function(state) {
-      var baseToken, overlayToken;
-      if (base.blankLine) baseToken = base.blankLine(state.base);
-      if (overlay.blankLine) overlayToken = overlay.blankLine(state.overlay);
-
-      return overlayToken == null ?
-        baseToken :
-        (combine && baseToken != null ? baseToken + " " + overlayToken : overlayToken);
+      if (base.blankLine) base.blankLine(state.base);
+      if (overlay.blankLine) overlay.blankLine(state.overlay);
     }
   };
 };
 
 });