Add "Sign In" button to the account chooser on Mac.

chrome/browser/ui/cocoa/passwords/passwords_bubble_utils.mm

Index: chrome/browser/ui/cocoa/passwords/passwords_bubble_utils.mm
diff --git a/chrome/browser/ui/cocoa/passwords/passwords_bubble_utils.mm b/chrome/browser/ui/cocoa/passwords/passwords_bubble_utils.mm
index 1ba951b62d9ff93f7ed0899828faf9fbb668b841..a8d22ff62eb0da5d829af7e1529afa4329491bbb 100644
--- a/chrome/browser/ui/cocoa/passwords/passwords_bubble_utils.mm
+++ b/chrome/browser/ui/cocoa/passwords/passwords_bubble_utils.mm
@@ -107,6 +107,18 @@ NSButton* DialogButton(NSString* title) {
   return button.autorelease();
 }
 
+NSButton* BiggerDialogButton(NSString* title) {
+  base::scoped_nsobject<NSButton> button(
+      [[NSButton alloc] initWithFrame:NSZeroRect]);
+  CGFloat fontSize = [NSFont systemFontSizeForControlSize:NSRegularControlSize];
+  [button setFont:[NSFont systemFontOfSize:fontSize]];
+  [button setTitle:title];
+  [button setBezelStyle:NSRoundedBezelStyle];
+  [[button cell] setControlSize:NSRegularControlSize];
+  [button sizeToFit];
+  return button.autorelease();
+}
+
 HyperlinkTextView* TitleBubbleLabelWithLink(const base::string16& text,
                                             gfx::Range range,
                                             id<NSTextViewDelegate> delegate) {