Move InsertStyleSheet out of TestRunnerForSpecificView

R=avi@chromium.org

Bug: 866140
Change-Id: I4684093db40f628b273c343352a74118830df824
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2202157
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#768829}

content/shell/renderer/web_test/test_runner.cc

@@ -886,8 +886,8 @@ void TestRunnerBindings::AddOriginAccessAllowListEntry(
 }
 
 void TestRunnerBindings::InsertStyleSheet(const std::string& source_code) {
-  if (runner_)
-    runner_->InsertStyleSheet(source_code);
+  GetWebFrame()->GetDocument().InsertStyleSheet(
+      blink::WebString::FromUTF8(source_code));
 }
 
 bool TestRunnerBindings::FindString(

content/shell/renderer/web_test/test_runner.h

@@ -316,10 +316,6 @@ class TestRunner {
                                      const std::string& destination_host,
                                      bool allow_destination_subdomains);
 
-  // Add |source_code| as an injected stylesheet to the active document of the
-  // window of the current V8 context.
-  void InsertStyleSheet(const std::string& source_code);
-
   // Enables or disables subpixel positioning (i.e. fractional X positions for
   // glyphs) in text rendering on Linux. Since this method changes global
   // settings, tests that call it must use their own custom font family for

content/shell/renderer/web_test/test_runner_for_specific_view.cc

@@ -446,12 +446,6 @@ void TestRunnerForSpecificView::SetIsolatedWorldInfo(
   web_view()->FocusedFrame()->SetIsolatedWorldInfo(world_id, info);
 }
 
-void TestRunner::InsertStyleSheet(const std::string& source_code) {
-  blink::WebLocalFrame::FrameForCurrentContext()
-      ->GetDocument()
-      .InsertStyleSheet(blink::WebString::FromUTF8(source_code));
-}
-
 blink::WebLocalFrame* TestRunnerForSpecificView::GetLocalMainFrame() {
   if (!web_view()->MainFrame()->IsWebLocalFrame()) {
     // Hitting the check below uncovers a new scenario that requires OOPIF