Move <webview> API to chrome layer

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index df7068a96026ba478bfaab1617f0e7bc29d48926..819df55549b0c60be47f977be4bacdb301c5143f 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -16,6 +16,7 @@
 #include "base/utf_string_conversions.h"
 #include "chrome/app/breakpad_mac.h"
 #include "chrome/browser/browser_about_handler.h"
+#include "chrome/browser/browser_plugin/chrome_browser_plugin_guest_observer.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/browsing_data/browsing_data_helper.h"
 #include "chrome/browser/browsing_data/browsing_data_remover.h"
@@ -1038,6 +1039,11 @@ bool ChromeContentBrowserClient::ShouldSwapProcessesForRedirect(
       ExtensionURLInfo(current_url), ExtensionURLInfo(new_url), false);
 }
 
+void ChromeContentBrowserClient::BrowserPluginGuestCreated(
+    content::BrowserPluginGuest* guest) {
+  new ChromeBrowserPluginGuestObserver(guest);
+}
+
 std::string ChromeContentBrowserClient::GetCanonicalEncodingNameByAliasName(
     const std::string& alias_name) {
   return CharacterEncoding::GetCanonicalEncodingNameByAliasName(alias_name);