Prototype fix for version shear across updates.

chrome/browser/first_run/upgrade_util_win.h

Index: chrome/browser/first_run/upgrade_util_win.h
diff --git a/chrome/browser/first_run/upgrade_util_win.h b/chrome/browser/first_run/upgrade_util_win.h
index c5a5d5c0d13939c30c405293cffac10b6cff2709..c67e1d0cc032a88b14deca5e767b449bbebe137b 100644
--- a/chrome/browser/first_run/upgrade_util_win.h
+++ b/chrome/browser/first_run/upgrade_util_win.h
@@ -16,6 +16,13 @@ namespace upgrade_util {
 // is no new_chrome.exe or the swap fails the return is false;
 bool SwapNewChromeExeIfPresent();
 
+// Returns true if the currently running chrome.exe has been renamed to
+// old_chrome.exe. This means that the running executable is out of date and
+// has been renamed by the in-use update process. old_chrome.exe shouldn't
+// continue on and run as the browser process since it may end up launching
+// newer chrome.exes as child processes resulting in a version mismatch.
+bool IsRunningOldChrome();
+
 // Combines the two methods, RelaunchChromeBrowser and
 // SwapNewChromeExeIfPresent, to perform the rename and relaunch of
 // the browser. Note that relaunch does NOT exit the existing browser process.