gesture nav: Disable for M28.

BUG=244567
R=sky@chromium.org

Review URL: https://codereview.chromium.org/16335006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@203791 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/ui/browser.cc

@@ -1127,7 +1127,7 @@ void Browser::TabStripEmpty() {
 bool Browser::CanOverscrollContent() const {
 #if defined(USE_AURA)
   bool overscroll_enabled = CommandLine::ForCurrentProcess()->
-      GetSwitchValueASCII(switches::kOverscrollHistoryNavigation) != "0";
+      GetSwitchValueASCII(switches::kOverscrollHistoryNavigation) == "1";
   if (!overscroll_enabled)
     return false;
   if (is_app() || is_devtools() || !is_type_tabbed())

content/browser/renderer_host/render_widget_host_impl.cc

@@ -209,7 +209,7 @@ RenderWidgetHostImpl::RenderWidgetHostImpl(RenderWidgetHostDelegate* delegate,
 
 #if defined(USE_AURA)
   bool overscroll_enabled = CommandLine::ForCurrentProcess()->
-      GetSwitchValueASCII(switches::kOverscrollHistoryNavigation) != "0";
+      GetSwitchValueASCII(switches::kOverscrollHistoryNavigation) == "1";
   SetOverscrollControllerEnabled(overscroll_enabled);
 #endif
 }

content/browser/web_contents/web_contents_screenshot_manager.cc

@@ -71,7 +71,7 @@ WebContentsScreenshotManager::~WebContentsScreenshotManager() {
 
 void WebContentsScreenshotManager::TakeScreenshot() {
   static bool overscroll_enabled = CommandLine::ForCurrentProcess()->
-      GetSwitchValueASCII(switches::kOverscrollHistoryNavigation) != "0";
+      GetSwitchValueASCII(switches::kOverscrollHistoryNavigation) == "1";
   if (!overscroll_enabled)
     return;
 

content/browser/web_contents/web_contents_view_aura_browsertest.cc

@@ -86,6 +86,11 @@ class WebContentsViewAuraTest : public ContentBrowserTest {
       : screenshot_manager_(NULL) {
   }
 
+  virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
+    command_line->AppendSwitchASCII(switches::kOverscrollHistoryNavigation,
+                                    std::string("1"));
+  }
+
   // Executes the javascript synchronously and makes sure the returned value is
   // freed properly.
   void ExecuteSyncJSFunction(RenderViewHost* rvh, const std::string& jscript) {