DevTools: Use CodeMirror modes instead of highlight tokenizers

Source/devtools/front_end/cm/cmdevtools.css

Index: Source/devtools/front_end/cm/cmdevtools.css
diff --git a/Source/devtools/front_end/cm/cmdevtools.css b/Source/devtools/front_end/cm/cmdevtools.css
index 9290b7f7c68ce8723515735d3a85dd24f73cddb0..b9cb802f0d28fe42678e03dfd943182e84220e8f 100644
--- a/Source/devtools/front_end/cm/cmdevtools.css
+++ b/Source/devtools/front_end/cm/cmdevtools.css
@@ -195,32 +195,6 @@
     z-index: -1;
 }
 
-span.cm-js-keyword {color: rgb(170, 13, 145);}
-span.cm-js-number {color: rgb(28, 0, 207);}
-span.cm-js-comment {color: rgb(0, 116, 0);}
-span.cm-js-string {color: rgb(196, 26, 22);}
-span.cm-js-string-2 {color: rgb(196, 26, 22);}
-
-span.cm-css-keyword { color: rgb(7, 144, 154);}
-span.cm-css-number {color: rgb(50, 0, 255);}
-span.cm-css-comment {color: rgb(0, 116, 0);}
-span.cm-css-def {color: rgb(200, 0, 0);}
-span.cm-css-meta {color: rgb(200, 0, 0);}
-span.cm-css-atom {color: rgb(7, 144, 154);}
-span.cm-css-string {color: rgb(7, 144, 154);}
-span.cm-css-string-2 {color: rgb(7, 144, 154);}
-span.cm-css-link {color: rgb(7, 144, 154);}
-span.cm-css-variable {color: rgb(200, 0, 0);}
-span.cm-css-variable-2 {color: rgb(0, 0, 128);}
-span.cm-css-property {color: rgb(200, 0, 0);}
-
-span.cm-xml-meta {color: rgb(192, 192, 192);}
-span.cm-xml-comment {color: rgb(35, 110, 37);}
-span.cm-xml-string {color: rgb(26, 26, 166);}
-span.cm-xml-tag {color: rgb(136, 18, 128);}
-span.cm-xml-attribute {color: rgb(153, 69, 0);}
-span.cm-xml-link {color: #00e;}
-
 .CodeMirror .webkit-html-message-bubble {
     box-shadow: black 0px 2px 5px;
     border-radius: 9px;