Enable Roboto by default for testing purpose.

ui/gfx/render_text_unittest.cc

Index: ui/gfx/render_text_unittest.cc
diff --git a/ui/gfx/render_text_unittest.cc b/ui/gfx/render_text_unittest.cc
index 7baa201c195b3632878fd631d4f357fbf4c04d3c..03425aa2b38c4daeadeb576480d48a9242eddd5d 100644
--- a/ui/gfx/render_text_unittest.cc
+++ b/ui/gfx/render_text_unittest.cc
@@ -2423,7 +2423,7 @@ TEST_F(RenderTextTest, TextDoesntClip) {
     for (int y = 0; y < kCanvasSize.height(); ++y) {
       // Allow one column of anti-aliased pixels past the expected width.
       SkColor color = buffer[width + y * kCanvasSize.width()];
-      EXPECT_LT(230U, color_utils::GetLuminanceForColor(color)) << string;
+      EXPECT_LT(220U, color_utils::GetLuminanceForColor(color)) << string;
       for (int x = 1; x < kTestWidth; ++x) {
         color = buffer[width + x + y * kCanvasSize.width()];
         EXPECT_EQ(SK_ColorWHITE, color) << string;