Remove using directives ("using namespace x") from scheduler_integration_tests.

Bug: 82078
Change-Id: If21fe11af38287e0e61e19edb595411d96805e34
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1867811
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Alexander Timin <altimin@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707326}

third_party/blink/renderer/core/scheduler_integration_tests/frame_throttling_test.cc

@@ -36,7 +36,7 @@ using testing::_;
 
 namespace blink {
 
-using namespace html_names;
+using html_names::kStyleAttr;
 
 // NOTE: This test uses <iframe sandbox> to create cross origin iframes.
 
@@ -285,7 +285,7 @@ TEST_P(FrameThrottlingTest, ThrottledLifecycleUpdate) {
   // TODO(skyostil): these expectations are either wrong, or the test is
   // not exercising the code correctly. PaintClean means the entire lifecycle
   // ran.
-  frame_element->setAttribute(kWidthAttr, "50");
+  frame_element->setAttribute(html_names::kWidthAttr, "50");
   CompositeFrame();
 
   if (RuntimeEnabledFeatures::CompositeAfterPaintEnabled()) {