[ios] Implemented LoadHtml w/o using data:// URLs.

ios/web/web_state/ui/crw_web_controller.mm

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/web/web_state/ui/crw_web_controller.h"
 
 #import <WebKit/WebKit.h>
 
 #import <objc/runtime.h>
 #include <stddef.h>
@@ skipping 4749 matching lines @@
                         [self handleLoadError:loadError inMainFrame:YES];
                       else
                         self.webStateImpl->SetContentsMimeType("text/html");
                     }];
 }
 
 - (void)loadHTML:(NSString*)HTML forURL:(const GURL&)URL {
   // Remove the transient content view.
   [self clearTransientContentView];
 
-  DLOG_IF(WARNING, !_webView) << "_webView null while trying to load HTML";
   _loadPhase = web::LOAD_REQUESTED;
+  [self ensureWebViewCreated];
+  DCHECK(_webView) << "_webView null while trying to load HTML";
   [_webView loadHTMLString:HTML baseURL:net::NSURLWithGURL(URL)];
 }
 
 - (void)loadHTML:(NSString*)HTML forAppSpecificURL:(const GURL&)URL {
   CHECK(web::GetWebClient()->IsAppSpecificURL(URL));
   [self loadHTML:HTML forURL:URL];
 }
 
 - (void)loadHTMLForCurrentURL:(NSString*)HTML {
   [self loadHTML:HTML forURL:self.currentURL];
@@ skipping 846 matching lines @@
   }
 
   return web::WEB_VIEW_DOCUMENT_TYPE_GENERIC;
 }
 
 - (NSString*)refererFromNavigationAction:(WKNavigationAction*)action {
   return [action.request valueForHTTPHeaderField:@"Referer"];
 }
 
 @end