Reset the default value of touch event flag back to "Auto".

content/public/test/content_browser_test.cc

Index: content/public/test/content_browser_test.cc
diff --git a/content/public/test/content_browser_test.cc b/content/public/test/content_browser_test.cc
index c8f358b034f584a76b823aefd0fc9c1a8e065e26..933f5148da37e88182f7e7ffacec364967c3869e 100644
--- a/content/public/test/content_browser_test.cc
+++ b/content/public/test/content_browser_test.cc
@@ -22,6 +22,7 @@
 #include "content/shell/common/shell_switches.h"
 #include "content/shell/renderer/layout_test/layout_test_content_renderer_client.h"
 #include "content/test/test_content_client.h"
+#include "ui/events/event_switches.h"
 
 #if defined(OS_ANDROID)
 #include "content/shell/app/shell_main_delegate.h"
@@ -57,6 +58,7 @@ ContentBrowserTest::~ContentBrowserTest() {
 void ContentBrowserTest::SetUp() {
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   command_line->AppendSwitch(switches::kContentBrowserTest);
+  command_line->AppendSwitch(switches::kTouchEvents);
 
   SetUpCommandLine(command_line);