Add a ExtensionBrowserTest base class

chrome/browser/views/find_bar_win_browsertest.cc

Index: chrome/browser/views/find_bar_win_browsertest.cc
diff --git a/chrome/browser/views/find_bar_win_browsertest.cc b/chrome/browser/views/find_bar_win_browsertest.cc
index de66f7acbaaf1e14d4672d5b7157e265937d69af..47d3c2ea44bd6cad5035cf9304f9e4a96466d66b 100644
--- a/chrome/browser/views/find_bar_win_browsertest.cc
+++ b/chrome/browser/views/find_bar_win_browsertest.cc
@@ -173,7 +173,7 @@ IN_PROC_BROWSER_TEST_F(FindInPageControllerTest, FindInPageFrames) {
 std::string FocusedOnPage(TabContents* tab_contents) {
   std::string result;
   ui_test_utils::ExecuteJavaScriptAndExtractString(
-      tab_contents,
+      tab_contents->render_view_host(),
       L"",
       L"window.domAutomationController.send(getFocusedElement());",
       &result);
@@ -214,7 +214,7 @@ IN_PROC_BROWSER_TEST_F(FindInPageControllerTest, FindInPageEndState) {
   // Move the selection to link 1, after searching.
   std::string result;
   ui_test_utils::ExecuteJavaScriptAndExtractString(
-      tab_contents,
+      tab_contents->render_view_host(),
       L"",
       L"window.domAutomationController.send(selectLink1());",
       &result);