DevTools: remove hand-written optimistic JSON parser introduced in r183821.

Source/devtools/front_end/network/RequestJSONView.js

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 118 matching lines @@
     }
     return (result.length > 1) ? result : result[0];
 }
 
 /**
  * @param {string} text
  * @return {?WebInspector.ParsedJSON}
  */
 WebInspector.RequestJSONView.parseJSON = function(text)
 {
-    // Trim stubs like "while(1)", "for(;;)", weird numbers, etc. We need JSON start.
+    // Do not treat HTML as JSON.
+    if (text.startsWith("<"))
+        return null;
     var inner = WebInspector.RequestJSONView._findBrackets(text, "{", "}");
     var inner2 = WebInspector.RequestJSONView._findBrackets(text, "[", "]");
     inner = inner2.length > inner.length ? inner2 : inner;
-    var inner3 = WebInspector.RequestJSONView._findBrackets(text, "(", ")");
-    if (inner3.length - 2 > inner.length) {
-        inner = inner3;
-        ++inner.start;
-        --inner.end;
-    }
-    if (inner.length === -1)
+
+    // Return on blank payloads or on payloads significantly smaller than original text.
+    if (inner.length === -1 || text.length - inner.length > 80)
         return null;
 
-
     var prefix = text.substring(0, inner.start);
     var suffix = text.substring(inner.end + 1);
     text = text.substring(inner.start, inner.end + 1);
 
+    // Only process valid JSONP.
+    if (suffix.length && !(suffix.trim().startsWith(")") && prefix.trim().endsWith("(")))
+        return null;
+
     try {
         return new WebInspector.ParsedJSON(WebInspector.RequestJSONView._buildObjectFromJSON(text), prefix, suffix);
     } catch (e) {
         return null;
     }
 }
 
 /**
  * @param {string} text
  * @param {string} open
@@ skipping 35 matching lines @@
 
 /**
  * @constructor
  */
 WebInspector.ParsedJSON = function(data, prefix, suffix)
 {
     this.data = data;
     this.prefix = prefix;
     this.suffix = suffix;
 }