Remove usages of WebContents::GetRenderViewHost().

This CL was uploaded by git cl split.

R=mlamouri@chromium.org

Bug: 1142671
Change-Id: I14e20b732dd574ce2bdaba4ce2d885fa40795f40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500703
Auto-Submit: Lucas Gadani <lfg@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823648}

content/browser/screen_orientation/screen_orientation_provider.cc

@@ -42,8 +42,8 @@ void ScreenOrientationProvider::LockOrientation(
   }
 
   if (delegate_->FullScreenRequired(web_contents())) {
-    RenderViewHostImpl* rvhi =
-        static_cast<RenderViewHostImpl*>(web_contents()->GetRenderViewHost());
+    RenderViewHostImpl* rvhi = static_cast<RenderViewHostImpl*>(
+        web_contents()->GetMainFrame()->GetRenderViewHost());
     if (!rvhi) {
       NotifyLockResult(ScreenOrientationLockResult::
                            SCREEN_ORIENTATION_LOCK_RESULT_ERROR_CANCELED);
@@ -149,7 +149,8 @@ void ScreenOrientationProvider::DidFinishNavigation(
 
 device::mojom::ScreenOrientationLockType
 ScreenOrientationProvider::GetNaturalLockType() const {
-  RenderWidgetHost* rwh = web_contents()->GetRenderViewHost()->GetWidget();
+  RenderWidgetHost* rwh =
+      web_contents()->GetMainFrame()->GetRenderViewHost()->GetWidget();
   if (!rwh)
     return device::mojom::ScreenOrientationLockType::DEFAULT;
 
@@ -181,7 +182,8 @@ ScreenOrientationProvider::GetNaturalLockType() const {
 
 bool ScreenOrientationProvider::LockMatchesCurrentOrientation(
     device::mojom::ScreenOrientationLockType lock) {
-  RenderWidgetHost* rwh = web_contents()->GetRenderViewHost()->GetWidget();
+  RenderWidgetHost* rwh =
+      web_contents()->GetMainFrame()->GetRenderViewHost()->GetWidget();
   if (!rwh)
     return false;