Update to Chromium version 74.0.3729.0 (#638880)

- Windows: 10.0.17763.0 SDK is now required.
- Mac: 10.13 SDK is now required.
- Removed CefRequestContext::ResolveHostCached which is no longer supported by Chromium.

libcef/browser/extensions/extension_function_details.cc

@@ -21,8 +21,8 @@
 #include "extensions/browser/extension_function_dispatcher.h"
 #include "extensions/common/error_utils.h"
 
-using content::WebContents;
 using content::RenderViewHost;
+using content::WebContents;
 
 namespace extensions {
 
@@ -92,7 +92,7 @@ class CefGetExtensionLoadFileCallbackImpl
   static std::unique_ptr<std::string> LoadFileFromStream(
       const std::string& file,
       CefRefPtr<CefStreamReader> stream) {
-    base::AssertBlockingAllowedDeprecated();
+    CEF_REQUIRE_BLOCKING();
 
     // Move to the end of the stream.
     stream->Seek(0, SEEK_END);

libcef/browser/extensions/pdf_web_contents_helper_client.cc

@@ -19,4 +19,8 @@ void CefPDFWebContentsHelperClient::OnPDFHasUnsupportedFeature(
 
 void CefPDFWebContentsHelperClient::OnSaveURL(content::WebContents* contents) {}
 
+void CefPDFWebContentsHelperClient::SetPluginCanSave(
+    content::WebContents* contents,
+    bool can_save) {}
+
 }  // namespace extensions

libcef/browser/extensions/pdf_web_contents_helper_client.h

@@ -21,6 +21,7 @@ class CefPDFWebContentsHelperClient : public pdf::PDFWebContentsHelperClient {
                                  int content_restrictions) override;
   void OnPDFHasUnsupportedFeature(content::WebContents* contents) override;
   void OnSaveURL(content::WebContents* contents) override;
+  void SetPluginCanSave(content::WebContents* contents, bool can_save) override;
 
   DISALLOW_COPY_AND_ASSIGN(CefPDFWebContentsHelperClient);
 };