Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/installer/util/master_preferences_unittest.cc

Index: chrome/installer/util/master_preferences_unittest.cc
diff --git a/chrome/installer/util/master_preferences_unittest.cc b/chrome/installer/util/master_preferences_unittest.cc
index ba8edfccc5889fe1ab802b3d238dee4aae4c3e56..4a6182f1925d25cd9918b5940655fbfb8e477ebd 100644
--- a/chrome/installer/util/master_preferences_unittest.cc
+++ b/chrome/installer/util/master_preferences_unittest.cc
@@ -76,7 +76,7 @@ TEST_F(MasterPreferencesTest, ParseDistroParams) {
     "  }\n"
     "} \n";
 
-  EXPECT_TRUE(file_util::WriteFile(prefs_file(), text, strlen(text)));
+  EXPECT_TRUE(base::WriteFile(prefs_file(), text, strlen(text)));
   installer::MasterPreferences prefs(prefs_file());
   EXPECT_TRUE(prefs.read_from_file());
 
@@ -135,7 +135,7 @@ TEST_F(MasterPreferencesTest, ParseMissingDistroParams) {
     "  }\n"
     "} \n";
 
-  EXPECT_TRUE(file_util::WriteFile(prefs_file(), text, strlen(text)));
+  EXPECT_TRUE(base::WriteFile(prefs_file(), text, strlen(text)));
   installer::MasterPreferences prefs(prefs_file());
   EXPECT_TRUE(prefs.read_from_file());
 
@@ -194,7 +194,7 @@ TEST_F(MasterPreferencesTest, FirstRunTabs) {
     "  ]\n"
     "} \n";
 
-  EXPECT_TRUE(file_util::WriteFile(prefs_file(), text, strlen(text)));
+  EXPECT_TRUE(base::WriteFile(prefs_file(), text, strlen(text)));
   installer::MasterPreferences prefs(prefs_file());
   typedef std::vector<std::string> TabsVector;
   TabsVector tabs = prefs.GetFirstRunTabs();
@@ -252,7 +252,7 @@ TEST_F(MasterPreferencesTest, GetInstallPreferencesTest) {
     "     \"verbose_logging\": false\n"
     "  }\n"
     "} \n";
-  EXPECT_TRUE(file_util::WriteFile(prefs_file, text, strlen(text)));
+  EXPECT_TRUE(base::WriteFile(prefs_file, text, strlen(text)));
 
   // Make sure command line values override the values in master preferences.
   std::wstring cmd_str(