Don't intercept Flash navigations when the current page is the Flash download page.

chrome/browser/plugins/flash_download_interception_unittest.cc

 // Copyright 2016 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.
 
 #include "chrome/browser/plugins/flash_download_interception.h"
 
 #include "base/test/scoped_feature_list.h"
 #include "chrome/browser/content_settings/host_content_settings_map_factory.h"
 #include "chrome/common/chrome_features.h"
 #include "chrome/test/base/chrome_render_view_host_test_harness.h"
@@ skipping 55 matching lines @@
       host_content_settings_map(), GURL("http://source-page.com"),
       GURL("https://www.example.com"), true));
 
   EXPECT_FALSE(FlashDownloadInterception::ShouldStopFlashDownloadAction(
       host_content_settings_map(), GURL("http://source-page.com"),
       GURL("http://example.com/get.adobe.com/flashplayer"), true));
 
   EXPECT_FALSE(FlashDownloadInterception::ShouldStopFlashDownloadAction(
       host_content_settings_map(), GURL("http://source-page.com"),
       GURL("http://ww.macromedia.com/go/getflashplayer"), true));
+
+  // Don't intercept navigations occurring on the flash download page.
+  EXPECT_FALSE(FlashDownloadInterception::ShouldStopFlashDownloadAction(
+      host_content_settings_map(), GURL("https://get.adobe.com/flashplayer/"),
+      GURL("https://get.adobe.com/flashplayer/"), true));
 }
 
 TEST_F(FlashDownloadInterceptionTest, NavigationThrottleCancelsNavigation) {
   base::test::ScopedFeatureList feature_list;
   feature_list.InitAndEnableFeature(features::kPreferHtmlOverPlugins);
 
   // Set the source URL to an HTTP source.
   NavigateAndCommit(GURL("http://example.com"));
 
   std::unique_ptr<NavigationHandle> handle =
@@ skipping 32 matching lines @@
                                 CONTENT_SETTING_BLOCK);
   EXPECT_TRUE(FlashDownloadInterception::ShouldStopFlashDownloadAction(
       host_content_settings_map(), GURL("http://source-page.com"),
       GURL("https://get.adobe.com/flashplayer/"), true));
   map->SetDefaultContentSetting(CONTENT_SETTINGS_TYPE_PLUGINS,
                                 CONTENT_SETTING_DETECT_IMPORTANT_CONTENT);
   EXPECT_TRUE(FlashDownloadInterception::ShouldStopFlashDownloadAction(
       host_content_settings_map(), GURL("http://source-page.com"),
       GURL("https://get.adobe.com/flashplayer/"), true));
 }