Remove usages of WebContents::GetRenderViewHost().

This CL was uploaded by git cl split.

R=eladalon@chromium.org

Bug: 1142671
Change-Id: I7d3e1a64045a53d85d3358916d87fda0ec01323e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500608
Auto-Submit: Lucas Gadani <lfg@chromium.org>
Reviewed-by: Elad Alon <eladalon@chromium.org>
Commit-Queue: Elad Alon <eladalon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821172}

chrome/browser/extensions/api/webrtc_logging_private/webrtc_logging_private_apitest.cc

@@ -398,7 +398,8 @@ class WebrtcLoggingPrivateApiTest : public extensions::ExtensionApiTest {
 
   void SetUpPeerConnection(const std::string& session_id = "") {
     auto* manager = WebRtcEventLogManager::GetInstance();
-    auto* rph = web_contents()->GetRenderViewHost()->GetProcess();
+    auto* rph =
+        web_contents()->GetMainFrame()->GetRenderViewHost()->GetProcess();
 
     const int render_process_id = rph->GetID();
     const int lid = 0;