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

chrome/browser/chrome_browser_main.cc

Index: chrome/browser/chrome_browser_main.cc
===================================================================
--- chrome/browser/chrome_browser_main.cc	(revision 112974)
+++ chrome/browser/chrome_browser_main.cc	(working copy)
@@ -1088,11 +1088,11 @@
 
   // Create a 100% field trial based on the brand code.
   if (LowerCaseEqualsASCII(brand, "ecdb")) {
-    base::FieldTrialList::CreateFieldTrial(kDefaultAppsTrial_Name,
-                                           kDefaultAppsTrial_NoAppsGroup);
+    base::FieldTrialList::CreateFieldTrial(kDefaultAppsTrialName,
+                                           kDefaultAppsTrialNoAppsGroup);
   } else if (LowerCaseEqualsASCII(brand, "ecda")) {
-    base::FieldTrialList::CreateFieldTrial(kDefaultAppsTrial_Name,
-                                           kDefaultAppsTrial_WithAppsGroup);
+    base::FieldTrialList::CreateFieldTrial(kDefaultAppsTrialName,
+                                           kDefaultAppsTrialWithAppsGroup);
   }
 }