Update some uses of Value in chrome/browser to use the base:: namespace.

chrome/browser/prefs/incognito_mode_prefs_unittest.cc

Index: chrome/browser/prefs/incognito_mode_prefs_unittest.cc
diff --git a/chrome/browser/prefs/incognito_mode_prefs_unittest.cc b/chrome/browser/prefs/incognito_mode_prefs_unittest.cc
index 598606e0e738a708e3e933837c0a1b1f44d3eaca..ea15b9529ff3edd9844fe903c6de207fc3d40eaf 100644
--- a/chrome/browser/prefs/incognito_mode_prefs_unittest.cc
+++ b/chrome/browser/prefs/incognito_mode_prefs_unittest.cc
@@ -38,17 +38,20 @@ TEST_F(IncognitoModePrefsTest, IntToAvailability) {
 
 TEST_F(IncognitoModePrefsTest, GetAvailability) {
   prefs_.SetUserPref(prefs::kIncognitoModeAvailability,
-                     Value::CreateIntegerValue(IncognitoModePrefs::ENABLED));
+                     base::Value::CreateIntegerValue(
+                         IncognitoModePrefs::ENABLED));
   EXPECT_EQ(IncognitoModePrefs::ENABLED,
             IncognitoModePrefs::GetAvailability(&prefs_));
 
   prefs_.SetUserPref(prefs::kIncognitoModeAvailability,
-                     Value::CreateIntegerValue(IncognitoModePrefs::DISABLED));
+                     base::Value::CreateIntegerValue(
+                         IncognitoModePrefs::DISABLED));
   EXPECT_EQ(IncognitoModePrefs::DISABLED,
             IncognitoModePrefs::GetAvailability(&prefs_));
 
   prefs_.SetUserPref(prefs::kIncognitoModeAvailability,
-                     Value::CreateIntegerValue(IncognitoModePrefs::FORCED));
+                     base::Value::CreateIntegerValue(
+                         IncognitoModePrefs::FORCED));
   EXPECT_EQ(IncognitoModePrefs::FORCED,
             IncognitoModePrefs::GetAvailability(&prefs_));
 }
@@ -65,7 +68,7 @@ typedef IncognitoModePrefsTest IncognitoModePrefsDeathTest;
 #if GTEST_HAS_DEATH_TEST
 TEST_F(IncognitoModePrefsDeathTest, MAYBE_GetAvailabilityBadValue) {
   prefs_.SetUserPref(prefs::kIncognitoModeAvailability,
-                     Value::CreateIntegerValue(-1));
+                     base::Value::CreateIntegerValue(-1));
 #if defined(NDEBUG) && defined(DCHECK_ALWAYS_ON)
   EXPECT_DEATH({
     IncognitoModePrefs::Availability availability =