Fix crash when a webview tries to load a plugin resource.

chrome/browser/apps/guest_view/web_view_browsertest.cc

Index: chrome/browser/apps/guest_view/web_view_browsertest.cc
diff --git a/chrome/browser/apps/guest_view/web_view_browsertest.cc b/chrome/browser/apps/guest_view/web_view_browsertest.cc
index 750604c7d3c2ccdb91a89afbdeb3031f25385ba2..1cd2904402a2933d9d02da2a021a1e1720c386f1 100644
--- a/chrome/browser/apps/guest_view/web_view_browsertest.cc
+++ b/chrome/browser/apps/guest_view/web_view_browsertest.cc
@@ -20,6 +20,7 @@
 #include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/test/base/ui_test_utils.h"
+#include "components/content_settings/core/browser/host_content_settings_map.h"
 #include "content/public/browser/gpu_data_manager.h"
 #include "content/public/browser/interstitial_page.h"
 #include "content/public/browser/interstitial_page_delegate.h"
@@ -2748,6 +2749,14 @@ IN_PROC_BROWSER_TEST_F(WebViewCaptureTest,
   TestHelper("testScreenshotCapture", "web_view/shim", NO_TEST_SERVER);
 }
 
+// Tests that browser process does not crash when loading plugin inside
+// <webview> with content settings set to CONTENT_SETTING_BLOCK.
+IN_PROC_BROWSER_TEST_F(WebViewTest, TestPlugin) {
+  browser()->profile()->GetHostContentSettingsMap()->SetDefaultContentSetting(
+      CONTENT_SETTINGS_TYPE_PLUGINS, CONTENT_SETTING_BLOCK);
+  TestHelper("testPlugin", "web_view/shim", NEEDS_TEST_SERVER);
+}
+
 #if defined(OS_WIN)
 // Test is disabled on Windows because it times out often.
 // http://crbug.com/403325