Remove testRunner.injectStyleSheet usage from layout tests.

LayoutTests/css3/device-adapt/viewport-user-agent-style.html

Index: LayoutTests/css3/device-adapt/viewport-user-agent-style.html
diff --git a/LayoutTests/css3/device-adapt/viewport-user-agent-style.html b/LayoutTests/css3/device-adapt/viewport-user-agent-style.html
index 9d6aff9f03cf7e0d546060675df2ce98c1bb8f72..a4830f00cf4e4155159945ccf90f3684a2cbca02 100644
--- a/LayoutTests/css3/device-adapt/viewport-user-agent-style.html
+++ b/LayoutTests/css3/device-adapt/viewport-user-agent-style.html
@@ -6,10 +6,8 @@
     <script src="../../resources/testharnessreport.js"></script>
     <script>
         if (window.testRunner) {
-            // FIXME: Emulate the android viewport UA stylesheet. We should test this
-            // based on the platform we're building for
-            testRunner.injectStyleSheet("@viewport {min-width: 980px}", true);
             internals.settings.setViewportEnabled(true);
+            internals.settings.setUseMobileViewportStyle(true);

[dcheng, 2015/04/02 04:41:18]

Depending on how trybot runs go, I may make this test android specific (or maybe
check in different baselines for different platforms).

         }
     </script>
     <style>