Change the account chooser on Win to look like in the mocks.

chrome/browser/ui/passwords/password_dialog_prompts.h

Index: chrome/browser/ui/passwords/password_dialog_prompts.h
diff --git a/chrome/browser/ui/passwords/password_dialog_prompts.h b/chrome/browser/ui/passwords/password_dialog_prompts.h
index 38fa909a001c736803efa011bb1f1c85ff310235..259db14dc00c504a2842b5115e5a5f0e26fadbe2 100644
--- a/chrome/browser/ui/passwords/password_dialog_prompts.h
+++ b/chrome/browser/ui/passwords/password_dialog_prompts.h
@@ -22,6 +22,9 @@ const int kTitleTopInset = 12;
 // The color of the content in the autosign-in first run prompt.
 const SkColor kAutoSigninTextColor = SkColorSetRGB(0x64, 0x64, 0x64);
 
+// The hover color of the account chooser.
+const SkColor kButtonHoverColor = SkColorSetRGB(0xEA, 0xEA, 0xEA);
+
 // A platform-independent interface for the account chooser dialog.
 class AccountChooserPrompt {
  public: