Fix sizing issues in the tab modal signin flow.

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

Index: chrome/browser/ui/webui/signin/inline_login_handler.cc
diff --git a/chrome/browser/ui/webui/signin/inline_login_handler.cc b/chrome/browser/ui/webui/signin/inline_login_handler.cc
index 80d536314821f9d7964d1055917d2f1cff196391..f127b29914813fb01f54a5f82aa4f4a8c3b11b3f 100644
--- a/chrome/browser/ui/webui/signin/inline_login_handler.cc
+++ b/chrome/browser/ui/webui/signin/inline_login_handler.cc
@@ -14,8 +14,10 @@
 #include "chrome/browser/extensions/signin/gaia_auth_extension_loader.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/signin_promo.h"
+#include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_navigator.h"
 #include "chrome/browser/ui/browser_navigator_params.h"
+#include "chrome/browser/ui/signin_view_controller_delegate.h"
 #include "chrome/common/pref_names.h"
 #include "components/metrics/metrics_pref_names.h"
 #include "components/prefs/pref_service.h"
@@ -27,6 +29,19 @@
 #include "google_apis/gaia/gaia_urls.h"
 #include "net/base/url_util.h"
 
+namespace {
+
+Browser* GetDesktopBrowser(content::WebUI* web_ui) {
+  Browser* browser = chrome::FindBrowserWithWebContents(
+      web_ui->GetWebContents());
+  if (!browser)
+    browser = chrome::FindLastActiveWithProfile(Profile::FromWebUI(web_ui));
+  DCHECK(browser);
+  return browser;
+}
+
+}  // namespace
+
 InlineLoginHandler::InlineLoginHandler() : weak_ptr_factory_(this) {}
 
 InlineLoginHandler::~InlineLoginHandler() {}
@@ -42,6 +57,9 @@ void InlineLoginHandler::RegisterMessages() {
       "switchToFullTab",
       base::Bind(&InlineLoginHandler::HandleSwitchToFullTabMessage,
                  base::Unretained(this)));
+  web_ui()->RegisterMessageCallback("navigationButtonClicked",
+      base::Bind(&InlineLoginHandler::HandleNavigationButtonClicked,
+                 base::Unretained(this)));
 }
 
 void InlineLoginHandler::HandleInitializeMessage(const base::ListValue* args) {
@@ -235,3 +253,11 @@ void InlineLoginHandler::HandleSwitchToFullTabMessage(
 
   web_ui()->CallJavascriptFunction("inline.login.closeDialog");
 }
+
+void InlineLoginHandler::HandleNavigationButtonClicked(
+    const base::ListValue* args) {
+  Browser* browser = GetDesktopBrowser(web_ui());
+  DCHECK(browser);
+
+  browser->signin_view_controller()->delegate()->PerformNavigation();
+}