diff --git a/chromium_src/chrome/browser/process_singleton_win.cc b/chromium_src/chrome/browser/process_singleton_win.cc
index 6bcd9ad25d7f..427ce89a58e2 100644
--- a/chromium_src/chrome/browser/process_singleton_win.cc
+++ b/chromium_src/chrome/browser/process_singleton_win.cc
@@ -77,19 +77,6 @@ BOOL CALLBACK BrowserWindowEnumeration(HWND window, LPARAM param) {
   return !*result;
 }
 
-// Convert Command line string to argv.
-base::CommandLine::StringVector CommandLineStringToArgv(
-    const std::wstring& command_line_string) {
-  int num_args = 0;
-  wchar_t** args = NULL;
-  args = ::CommandLineToArgvW(command_line_string.c_str(), &num_args);
-  base::CommandLine::StringVector argv;
-  for (int i = 0; i < num_args; ++i)
-    argv.push_back(std::wstring(args[i]));
-  LocalFree(args);
-  return argv;
-}
-
 bool ParseCommandLine(const COPYDATASTRUCT* cds,
                       base::CommandLine::StringVector* parsed_command_line,
                       base::FilePath* current_directory) {
@@ -143,7 +130,7 @@ bool ParseCommandLine(const COPYDATASTRUCT* cds,
     // Get command line.
     const std::wstring cmd_line =
         msg.substr(second_null + 1, third_null - second_null);
-    *parsed_command_line = CommandLineStringToArgv(cmd_line);
+    *parsed_command_line = base::CommandLine::FromString(cmd_line).argv();
     return true;
   }
   return false;
diff --git a/docs/api/app.md b/docs/api/app.md
index 8382944e619e..9d5183e1883a 100644
--- a/docs/api/app.md
+++ b/docs/api/app.md
@@ -398,6 +398,9 @@ non-minimized.
 This event is guaranteed to be emitted after the `ready` event of `app`
 gets emitted.
 
+**Note:** Extra command line arguments might be added by Chromium,
+such as `--original-process-start-time`.
+
 ### Event: 'remote-require'
 
 Returns:
diff --git a/patches/common/chromium/.patches b/patches/common/chromium/.patches
index 715b6cc968b3..cbddb766ba8e 100644
--- a/patches/common/chromium/.patches
+++ b/patches/common/chromium/.patches
@@ -67,7 +67,6 @@ tts.patch
 color_chooser.patch
 printing.patch
 verbose_generate_breakpad_symbols.patch
-chrome_process_finder.patch
 customizable_app_indicator_id_prefix.patch
 cross_site_document_resource_handler.patch
 content_allow_embedder_to_prevent_locking_scheme_registry.patch
diff --git a/patches/common/chromium/chrome_process_finder.patch b/patches/common/chromium/chrome_process_finder.patch
deleted file mode 100644
index f8901ea9f665..000000000000
--- a/patches/common/chromium/chrome_process_finder.patch
+++ /dev/null
@@ -1,45 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Milan Burda <miburda@microsoft.com>
-Date: Fri, 26 Oct 2018 20:45:49 +0200
-Subject: chrome_process_finder.patch
-
-Fix some problems when using app.makeSingleInstance on Windows
-* The original command line of new instances are passed instead
-  of the one modified by Chromium.
-* The command line is passed as Array.
-
-When using the app.makeSingleInstance API, the command line arguments
-of the new instance will be passed to existing instance. Without this patch,
-Chromium would append some new flags (kOriginalProcessStartTime and kFastStart).
-
-Reference: https://github.com/electron/electron/pull/3175
-
-diff --git a/chrome/browser/win/chrome_process_finder.cc b/chrome/browser/win/chrome_process_finder.cc
-index 4fdea2af27020303a66a747304c5ecce5cc698d5..598ba8171631dbcf7ad23bc4b5c74a750bbaa47c 100644
---- a/chrome/browser/win/chrome_process_finder.cc
-+++ b/chrome/browser/win/chrome_process_finder.cc
-@@ -43,15 +43,6 @@ NotifyChromeResult AttemptToNotifyRunningChrome(HWND remote_window,
-   if (!thread_id || !process_id)
-     return NOTIFY_FAILED;
- 
--  base::CommandLine command_line(*base::CommandLine::ForCurrentProcess());
--  command_line.AppendSwitchASCII(
--      switches::kOriginalProcessStartTime,
--      base::Int64ToString(
--          base::CurrentProcessInfo::CreationTime().ToInternalValue()));
--
--  if (fast_start)
--    command_line.AppendSwitch(switches::kFastStart);
--
-   // Send the command line to the remote chrome window.
-   // Format is "START\0<<<current directory>>>\0<<<commandline>>>".
-   std::wstring to_send(L"START\0", 6);  // want the NULL in the string.
-@@ -60,7 +51,7 @@ NotifyChromeResult AttemptToNotifyRunningChrome(HWND remote_window,
-     return NOTIFY_FAILED;
-   to_send.append(cur_dir.value());
-   to_send.append(L"\0", 1);  // Null separator.
--  to_send.append(command_line.GetCommandLineString());
-+  to_send.append(::GetCommandLineW());
-   to_send.append(L"\0", 1);  // Null separator.
- 
-   // Allow the current running browser window to make itself the foreground