Move ReadFileToString to the base namespace.

chrome/browser/nacl_host/test/nacl_gdb_browsertest.cc

Index: chrome/browser/nacl_host/test/nacl_gdb_browsertest.cc
diff --git a/chrome/browser/nacl_host/test/nacl_gdb_browsertest.cc b/chrome/browser/nacl_host/test/nacl_gdb_browsertest.cc
index 02b4a8c2249965368b7bb298f5f497c69a35ba74..01cbb83146aee8685493154918e61684275a46b9 100644
--- a/chrome/browser/nacl_host/test/nacl_gdb_browsertest.cc
+++ b/chrome/browser/nacl_host/test/nacl_gdb_browsertest.cc
@@ -55,12 +55,12 @@ class NaClGdbTest : public PPAPINaClNewlibTest {
     RunTestViaHTTP(test_name);
     env->UnSetVar("MOCK_NACL_GDB");
 
-    EXPECT_TRUE(file_util::ReadFileToString(mock_nacl_gdb_file, &content));
+    EXPECT_TRUE(base::ReadFileToString(mock_nacl_gdb_file, &content));
     EXPECT_STREQ("PASS", content.c_str());
     EXPECT_TRUE(base::DeleteFile(mock_nacl_gdb_file, false));
 
     content.clear();
-    EXPECT_TRUE(file_util::ReadFileToString(script_, &content));
+    EXPECT_TRUE(base::ReadFileToString(script_, &content));
     EXPECT_STREQ("PASS", content.c_str());
     EXPECT_TRUE(base::DeleteFile(script_, false));
   }