Move ReadFileToString to the base namespace.

base/file_util.h

Index: base/file_util.h
diff --git a/base/file_util.h b/base/file_util.h
index 9673a6111fead5450e04ce2a60ae78f11a7b8ce4..b4150f7368a1bba3e76f79c07f5a7c33105dc3ab 100644
--- a/base/file_util.h
+++ b/base/file_util.h
@@ -132,19 +132,18 @@ BASE_EXPORT bool ContentsEqual(const FilePath& filename1,
 BASE_EXPORT bool TextContentsEqual(const FilePath& filename1,
                                    const FilePath& filename2);
 
-}  // namespace base
-
-// -----------------------------------------------------------------------------
-
-namespace file_util {
-
 // Read the file at |path| into |contents|, returning true on success.
 // This function fails if the |path| contains path traversal components ('..').
 // |contents| may be NULL, in which case this function is useful for its
 // side effect of priming the disk cache.
 // Useful for unit tests.
-BASE_EXPORT bool ReadFileToString(const base::FilePath& path,
-                                  std::string* contents);
+BASE_EXPORT bool ReadFileToString(const FilePath& path, std::string* contents);
+
+}  // namespace base
+
+// -----------------------------------------------------------------------------
+
+namespace file_util {
 
 #if defined(OS_POSIX)
 // Read exactly |bytes| bytes from file descriptor |fd|, storing the result