DevTools: do not kill breakpoints in case of persistence and auto-reconnecting target.

third_party/WebKit/Source/devtools/front_end/bindings/BreakpointManager.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 92 matching lines @@
   }
 
   /**
    * @param {string} fromURL
    * @param {!Workspace.UISourceCode} toSourceCode
    */
   copyBreakpoints(fromURL, toSourceCode) {
     var breakpointItems = this._storage.breakpointItems(fromURL);
     for (var item of breakpointItems)
       this.setBreakpoint(toSourceCode, item.lineNumber, item.columnNumber, item.condition, item.enabled);
+    // Since we can not have two provisional breakpoints which point to the same url, remove one of them.
+    if (fromURL === toSourceCode.url()) {
+      var provisionalBreakpoints = this._provisionalBreakpointsForURL(fromURL);
+      for (var breakpoint of provisionalBreakpoints.values())
+        breakpoint.remove();
+    }
   }
 
   removeProvisionalBreakpointsForTest() {
     var breakpoints = this._provisionalBreakpoints.valuesArray();
     for (var i = 0; i < breakpoints.length; ++i)
       breakpoints[i].remove();
     this._provisionalBreakpoints.clear();
   }
 
   /**
@@ skipping 957 matching lines @@
     this.url = breakpoint._url;
     this.lineNumber = breakpoint.lineNumber();
     this.columnNumber = breakpoint.columnNumber();
     this.condition = breakpoint.condition();
     this.enabled = breakpoint.enabled();
   }
 };
 
 /** @type {!Bindings.BreakpointManager} */
 Bindings.breakpointManager;