[PasswordManagerClient] Find Browser with WebContents instead of Profile

In a multi-window scenario, FindBrowserWithProfile has to find the last
active one. Since ChromePasswordManagerClient is per WebContents, its
browser can be directly retrieved using FindBrowserWithWebContents.

Bug: None
Change-Id: I8f1cb0c1fe9cf7f8f1a34115a59bdbaf15aa1bb4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144145Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Victor Vianna <victorvianna@google.com>
Cr-Commit-Position: refs/heads/master@{#759220}

chrome/browser/password_manager/chrome_password_manager_client.cc

@@ -575,7 +575,7 @@ void ChromePasswordManagerClient::TriggerReauthForAccount(
 #if defined(OS_ANDROID)
   std::move(reauth_callback).Run(ReauthSucceeded(false));
 #else   // !defined(OS_ANDROID)
-  Browser* browser = chrome::FindBrowserWithProfile(profile_);
+  Browser* browser = chrome::FindBrowserWithWebContents(web_contents());
   if (!browser) {
     std::move(reauth_callback).Run(ReauthSucceeded(false));
     return;
@@ -600,7 +600,7 @@ void ChromePasswordManagerClient::TriggerReauthForAccount(
 
 void ChromePasswordManagerClient::TriggerSignIn() {
 #if BUILDFLAG(ENABLE_DICE_SUPPORT)
-  Browser* browser = chrome::FindBrowserWithProfile(profile_);
+  Browser* browser = chrome::FindBrowserWithWebContents(web_contents());
   if (!browser)
     return;
   if (SigninViewController* signin_controller =