Move ReadFileToString to the base namespace.

skia/ext/vector_canvas_unittest.cc

Index: skia/ext/vector_canvas_unittest.cc
diff --git a/skia/ext/vector_canvas_unittest.cc b/skia/ext/vector_canvas_unittest.cc
index a087aedf5d2d4adbd432e0e5400b1b940a4cdd05..b12363329b95fb86ac75f7663c9c1a1e8a89d361 100644
--- a/skia/ext/vector_canvas_unittest.cc
+++ b/skia/ext/vector_canvas_unittest.cc
@@ -86,7 +86,7 @@ class Image {
   // Creates the image from the given filename on disk.
   explicit Image(const base::FilePath& filename) : ignore_alpha_(true) {
     std::string compressed;
-    file_util::ReadFileToString(filename, &compressed);
+    base::ReadFileToString(filename, &compressed);
     EXPECT_TRUE(compressed.size());
 
     SkBitmap bitmap;
@@ -335,8 +335,7 @@ void LoadPngFileToSkBitmap(const base::FilePath& filename,
                            SkBitmap* bitmap,
                            bool is_opaque) {
   std::string compressed;
-  file_util::ReadFileToString(base::MakeAbsoluteFilePath(filename),
-                              &compressed);
+  base::ReadFileToString(base::MakeAbsoluteFilePath(filename), &compressed);
   ASSERT_TRUE(compressed.size());
 
   ASSERT_TRUE(gfx::PNGCodec::Decode(