Change ExecuteJavaScript* helper functions in browser_test_utils.{h,cc}

chrome/test/gpu/gpu_pixel_browsertest.cc

Index: chrome/test/gpu/gpu_pixel_browsertest.cc
diff --git a/chrome/test/gpu/gpu_pixel_browsertest.cc b/chrome/test/gpu/gpu_pixel_browsertest.cc
index 559eb5e3c0946a3cb177a2e4963a939cff904c5f..8b7eb5506ff56af2daf955f451d9e9a94b1983b3 100644
--- a/chrome/test/gpu/gpu_pixel_browsertest.cc
+++ b/chrome/test/gpu/gpu_pixel_browsertest.cc
@@ -178,14 +178,15 @@ class GpuPixelBrowserTest : public InProcessBrowserTest {
 
     gfx::Rect new_bounds = GetNewTabContainerBounds(tab_container_size);
 
-    std::wostringstream js_call;
+    std::ostringstream js_call;
     js_call << "preCallResizeInChromium(";
     js_call << new_bounds.width() << ", " << new_bounds.height();
     js_call << ");";
 
     ASSERT_TRUE(content::ExecuteJavaScript(
         chrome::GetActiveWebContents(browser())->GetRenderViewHost(),
-        L"", js_call.str()));
+        "",
+        js_call.str()));
 
     std::string message;
     ASSERT_TRUE(message_queue.WaitForMessage(&message));