Rename constants used with default apps to confrom with naming convention.

chrome/browser/ui/webui/ntp/new_tab_page_handler.cc

Index: chrome/browser/ui/webui/ntp/new_tab_page_handler.cc
===================================================================
--- chrome/browser/ui/webui/ntp/new_tab_page_handler.cc	(revision 112974)
+++ chrome/browser/ui/webui/ntp/new_tab_page_handler.cc	(working copy)
@@ -37,11 +37,11 @@
                             shown_page_type, kHistogramEnumerationMax);
 
   static bool default_apps_trial_exists =
-      base::FieldTrialList::TrialExists(kDefaultAppsTrial_Name);
+      base::FieldTrialList::TrialExists(kDefaultAppsTrialName);
   if (default_apps_trial_exists) {
     UMA_HISTOGRAM_ENUMERATION(
         base::FieldTrial::MakeName("NewTabPage.DefaultPageType",
-                                   kDefaultAppsTrial_Name),
+                                   kDefaultAppsTrialName),
         shown_page_type, kHistogramEnumerationMax);
   }
 
@@ -97,11 +97,11 @@
                             shown_page_type, kHistogramEnumerationMax);
 
   static bool default_apps_trial_exists =
-      base::FieldTrialList::TrialExists(kDefaultAppsTrial_Name);
+      base::FieldTrialList::TrialExists(kDefaultAppsTrialName);
   if (default_apps_trial_exists) {
     UMA_HISTOGRAM_ENUMERATION(
         base::FieldTrial::MakeName("NewTabPage.SelectedPageType",
-                                   kDefaultAppsTrial_Name),
+                                   kDefaultAppsTrialName),
         shown_page_type, kHistogramEnumerationMax);
   }
 }