Replace FilePath with base::FilePath in some more top level directories.

media/base/media_win.cc

Index: media/base/media_win.cc
diff --git a/media/base/media_win.cc b/media/base/media_win.cc
index 616d3700631b81210e052b5fc34c39ae54e228c6..cc8008919c31c1d03901e386a368567413dcc9db 100644
--- a/media/base/media_win.cc
+++ b/media/base/media_win.cc
@@ -28,7 +28,7 @@ static const char* kFFmpegDLL = "ffmpegsumo.dll";
 // guarantee this is only set once in a thread safe manner.
 static bool g_media_library_is_initialized = false;
 
-static bool InitializeMediaLibraryInternal(const FilePath& base_path) {
+static bool InitializeMediaLibraryInternal(const base::FilePath& base_path) {
   DCHECK(!g_media_library_is_initialized);
 
   // LoadLibraryEx(..., LOAD_WITH_ALTERED_SEARCH_PATH) cannot handle
@@ -47,7 +47,7 @@ static bool InitializeMediaLibraryInternal(const FilePath& base_path) {
   return g_media_library_is_initialized;
 }
 
-bool InitializeMediaLibrary(const FilePath& base_path) {
+bool InitializeMediaLibrary(const base::FilePath& base_path) {
   static const bool kMediaLibraryInitialized =
       InitializeMediaLibraryInternal(base_path);
   DCHECK_EQ(kMediaLibraryInitialized, g_media_library_is_initialized);
@@ -55,7 +55,7 @@ bool InitializeMediaLibrary(const FilePath& base_path) {
 }
 
 void InitializeMediaLibraryForTesting() {
-  FilePath file_path;
+  base::FilePath file_path;
   CHECK(PathService::Get(base::DIR_EXE, &file_path));
   CHECK(InitializeMediaLibrary(file_path));
 }