Stop proper code paths from using WebFrameContentDumper::DeprecatedDumpFrameTreeAsText

This patch removes all call sites of DeprecatedDumpFrameTreeAsText, except
the only one in ChromeRenderFrameObserver, which is improper. This is
a preparation for fixing ChromeRenderFrameObserver without affecting
other code paths.

Bug: 803403
Change-Id: I1873f3759533873a3068b45cc55743b4bb9758d6
Reviewed-on: https://chromium-review.googlesource.com/891543Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533186}

third_party/WebKit/Source/core/exported/WebFrameContentDumper.cpp

@@ -228,9 +228,16 @@ WebString WebFrameContentDumper::DeprecatedDumpFrameTreeAsText(
 WebString WebFrameContentDumper::DumpWebViewAsText(WebView* web_view,
                                                    size_t max_chars) {
   DCHECK(web_view);
+  WebLocalFrame* frame = web_view->MainFrame()->ToWebLocalFrame();
+  if (!frame)
+    return WebString();
+
   web_view->UpdateAllLifecyclePhases();
-  return WebFrameContentDumper::DeprecatedDumpFrameTreeAsText(
-      web_view->MainFrame()->ToWebLocalFrame(), max_chars);
+
+  StringBuilder text;
+  FrameContentAsPlainText(max_chars, ToWebLocalFrameImpl(frame)->GetFrame(),
+                          text);
+  return text.ToString();
 }
 
 WebString WebFrameContentDumper::DumpAsMarkup(WebLocalFrame* frame) {

third_party/WebKit/Source/core/scheduler/FrameThrottlingTest.cpp

@@ -891,8 +891,7 @@ TEST_P(FrameThrottlingTest, DumpThrottledFrame) {
   // The dumped contents should not include the throttled frame.
   DocumentLifecycle::AllowThrottlingScope throttling_scope(
       GetDocument().Lifecycle());
-  WebString result = WebFrameContentDumper::DeprecatedDumpFrameTreeAsText(
-      WebView().MainFrameImpl(), 1024);
+  WebString result = WebFrameContentDumper::DumpWebViewAsText(&WebView(), 1024);
   EXPECT_NE(std::string::npos, result.Utf8().find("main"));
   EXPECT_EQ(std::string::npos, result.Utf8().find("throttled"));
 }