Move ReadFileToString to the base namespace.

chrome/browser/policy/cloud/cloud_policy_browsertest.cc

Index: chrome/browser/policy/cloud/cloud_policy_browsertest.cc
diff --git a/chrome/browser/policy/cloud/cloud_policy_browsertest.cc b/chrome/browser/policy/cloud/cloud_policy_browsertest.cc
index d129f0a37f3f417456a43f9f50e6e3f0a74073bf..9fc7f7ba9538cf2abe4e833c4629a84ecaf8abbe 100644
--- a/chrome/browser/policy/cloud/cloud_policy_browsertest.cc
+++ b/chrome/browser/policy/cloud/cloud_policy_browsertest.cc
@@ -273,8 +273,7 @@ IN_PROC_BROWSER_TEST_F(CloudPolicyTest, FetchPolicyWithRotatedKey) {
 
   // Read the initial key.
   std::string initial_key;
-  ASSERT_TRUE(
-      file_util::ReadFileToString(user_policy_key_file_, &initial_key));
+  ASSERT_TRUE(base::ReadFileToString(user_policy_key_file_, &initial_key));
 
   PolicyMap empty;
   EXPECT_TRUE(empty.Equals(policy_service->GetPolicies(
@@ -295,8 +294,7 @@ IN_PROC_BROWSER_TEST_F(CloudPolicyTest, FetchPolicyWithRotatedKey) {
 
   // Verify that the key was rotated.
   std::string rotated_key;
-  ASSERT_TRUE(
-      file_util::ReadFileToString(user_policy_key_file_, &rotated_key));
+  ASSERT_TRUE(base::ReadFileToString(user_policy_key_file_, &rotated_key));
   EXPECT_NE(rotated_key, initial_key);
 
   // Another refresh using the same key won't rotate it again.
@@ -308,8 +306,7 @@ IN_PROC_BROWSER_TEST_F(CloudPolicyTest, FetchPolicyWithRotatedKey) {
   EXPECT_TRUE(expected.Equals(policy_service->GetPolicies(
       PolicyNamespace(POLICY_DOMAIN_CHROME, std::string()))));
   std::string current_key;
-  ASSERT_TRUE(
-      file_util::ReadFileToString(user_policy_key_file_, &current_key));
+  ASSERT_TRUE(base::ReadFileToString(user_policy_key_file_, &current_key));
   EXPECT_EQ(rotated_key, current_key);
 }
 #endif