Android: Use a ResourceThrottle to intercept GET downloads.

chrome/browser/android/chrome_web_contents_delegate_android.cc

Index: chrome/browser/android/chrome_web_contents_delegate_android.cc
diff --git a/chrome/browser/android/chrome_web_contents_delegate_android.cc b/chrome/browser/android/chrome_web_contents_delegate_android.cc
index 0f6ccd668eb50acc0fd060424c92d27d1d37a133..1377afd29ddf11125d4f7894090218079f401544 100644
--- a/chrome/browser/android/chrome_web_contents_delegate_android.cc
+++ b/chrome/browser/android/chrome_web_contents_delegate_android.cc
@@ -16,7 +16,6 @@
 #include "chrome/browser/ui/find_bar/find_tab_helper.h"
 #include "chrome/browser/ui/media_stream_infobar_delegate.h"
 #include "chrome/common/chrome_notification_types.h"
-#include "content/public/browser/android/download_controller_android.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_service.h"
@@ -25,7 +24,6 @@
 #include "content/public/common/file_chooser_params.h"
 #include "content/public/common/page_transition_types.h"
 #include "jni/ChromeWebContentsDelegateAndroid_jni.h"
-#include "net/http/http_request_headers.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/rect_f.h"
 
@@ -228,22 +226,6 @@ ChromeWebContentsDelegateAndroid::GetJavaScriptDialogManager() {
   return GetJavaScriptDialogManagerInstance();
 }
 
-void ChromeWebContentsDelegateAndroid::CanDownload(
-    content::RenderViewHost* source,
-    int request_id,
-    const std::string& request_method,
-    const base::Callback<void(bool)>& callback) {
-  if (request_method == net::HttpRequestHeaders::kGetMethod) {
-    content::DownloadControllerAndroid::Get()->CreateGETDownload(
-        source, request_id);
-    callback.Run(false);
-  }
-  // DownloadControllerAndroid::OnPostDownloadStarted() is called for the
-  // started download by the default DownloadUIController::Delegate
-  // implementation.
-  callback.Run(true);
-}
-
 void ChromeWebContentsDelegateAndroid::DidNavigateToPendingEntry(
     content::WebContents* source) {
   navigation_start_time_ = base::TimeTicks::Now();