Fix sizing issues in the tab modal signin flow.

chrome/browser/ui/webui/signin/inline_login_handler.h

Index: chrome/browser/ui/webui/signin/inline_login_handler.h
diff --git a/chrome/browser/ui/webui/signin/inline_login_handler.h b/chrome/browser/ui/webui/signin/inline_login_handler.h
index e16f4b96f7314d0f05dbb170bdb8d655e252b10f..aa5233ed940c535f266330687e0454383d4118d1 100644
--- a/chrome/browser/ui/webui/signin/inline_login_handler.h
+++ b/chrome/browser/ui/webui/signin/inline_login_handler.h
@@ -50,6 +50,10 @@ class InlineLoginHandler : public content::WebUIMessageHandler {
   // JS callback to switch the UI from a constrainted dialog to a full tab.
   void HandleSwitchToFullTabMessage(const base::ListValue* args);
 
+  // Handles the web ui message sent when the navigation button is clicked by
+  // the user, requesting either a back navigation or closing the dialog.
+  void HandleNavigationButtonClicked(const base::ListValue* args);
+
   virtual void SetExtraInitParams(base::DictionaryValue& params) {}
   virtual void CompleteLogin(const base::ListValue* args) = 0;