[chromedriver] Don't generate char events on Mac for KeyConverter.AllShorthandKeys.

chrome/test/chromedriver/key_converter_unittest.cc

Index: chrome/test/chromedriver/key_converter_unittest.cc
diff --git a/chrome/test/chromedriver/key_converter_unittest.cc b/chrome/test/chromedriver/key_converter_unittest.cc
index 9585be69555199a077e8e8424c03a52b0d3adb86..29a0ca540be1078d32d4e1aa762b4a641e09e74d 100644
--- a/chrome/test/chromedriver/key_converter_unittest.cc
+++ b/chrome/test/chromedriver/key_converter_unittest.cc
@@ -275,8 +275,20 @@ TEST(KeyConverter, MAYBE_AllShorthandKeys) {
       ->SetText("\r", "\r")
       ->Generate(&key_events);
   builder.Generate(&key_events);
-  builder.SetKeyCode(ui::VKEY_TAB)->SetText("\t", "\t")->Generate(&key_events);
-  builder.SetKeyCode(ui::VKEY_BACK)->SetText("\b", "\b")->Generate(&key_events);
+  builder.SetKeyCode(ui::VKEY_TAB)->SetText("\t", "\t");
+#if defined(USE_AURA) || defined(OS_LINUX)
+  builder.Generate(&key_events);
+#else
+  key_events.push_back(builder.SetType(kRawKeyDownEventType)->Build());
+  key_events.push_back(builder.SetType(kKeyUpEventType)->Build());
+#endif
+  builder.SetKeyCode(ui::VKEY_BACK)->SetText("\b", "\b");
+#if defined(USE_AURA) || defined(OS_LINUX)
+  builder.Generate(&key_events);
+#else
+  key_events.push_back(builder.SetType(kRawKeyDownEventType)->Build());
+  key_events.push_back(builder.SetType(kKeyUpEventType)->Build());
+#endif
   builder.SetKeyCode(ui::VKEY_SPACE)->SetText(" ", " ")->Generate(&key_events);
   CheckEventsReleaseModifiers("\n\r\n\t\b ", key_events);
 }