DevTools: Avoid browser crash on undock after frontend self reloading.

chrome/browser/devtools/devtools_window.cc

Index: chrome/browser/devtools/devtools_window.cc
diff --git a/chrome/browser/devtools/devtools_window.cc b/chrome/browser/devtools/devtools_window.cc
index f64a8f213db2db2c11106a15445dd369e2a8c8d5..7f086ce074018fe65719b085b7d20c887c38278d 100644
--- a/chrome/browser/devtools/devtools_window.cc
+++ b/chrome/browser/devtools/devtools_window.cc
@@ -1481,9 +1481,12 @@ content::WebContents* DevToolsWindow::GetInspectedWebContents() {
 }
 
 void DevToolsWindow::DocumentOnLoadCompletedInMainFrame() {
-  // Load is completed when both kIsDockedSet and kOnLoadFired happened.
-  // Here we set kOnLoadFired.
-  load_state_ = load_state_ == kIsDockedSet ? kLoadCompleted : kOnLoadFired;
+  // We could be in kLoadCompleted state already if frontend reloads itself.
+  if (load_state_ != kLoadCompleted) {
+    // Load is completed when both kIsDockedSet and kOnLoadFired happened.
+    // Here we set kOnLoadFired.
+    load_state_ = load_state_ == kIsDockedSet ? kLoadCompleted : kOnLoadFired;
+  }
   if (load_state_ == kLoadCompleted)
     LoadCompleted();
 }