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

third_party/WebKit/Source/devtools/front_end/bindings/BreakpointManager.js

Index: third_party/WebKit/Source/devtools/front_end/bindings/BreakpointManager.js
diff --git a/third_party/WebKit/Source/devtools/front_end/bindings/BreakpointManager.js b/third_party/WebKit/Source/devtools/front_end/bindings/BreakpointManager.js
index 88df8c07de7cbb1c99df450002bbcead19cc7d72..2883d3756ec26e19acd98f51eef3269f20270114 100644
--- a/third_party/WebKit/Source/devtools/front_end/bindings/BreakpointManager.js
+++ b/third_party/WebKit/Source/devtools/front_end/bindings/BreakpointManager.js
@@ -110,6 +110,12 @@ Bindings.BreakpointManager = class extends Common.Object {
     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() {