Rewrite std::string("") to std::string(), Linux edition.

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 71d9478d266b6e6eae33687ae5e4e511292fd64b..82972a08c20a2a84b22f14e8584fdd460c98ca84 100644
--- a/chrome/test/gpu/gpu_pixel_browsertest.cc
+++ b/chrome/test/gpu/gpu_pixel_browsertest.cc
@@ -145,7 +145,7 @@ class GpuPixelBrowserTest : public InProcessBrowserTest {
     const char* test_status_prefixes[] = {"DISABLED_", "FLAKY_", "FAILS_"};
     for (size_t i = 0; i < arraysize(test_status_prefixes); ++i) {
       ReplaceFirstSubstringAfterOffset(
-          &test_name_, 0, test_status_prefixes[i], "");
+          &test_name_, 0, test_status_prefixes[i], std::string());
     }
 
     ui::DisableTestCompositor();