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

ui/base/dragdrop/os_exchange_data_win_unittest.cc

Index: ui/base/dragdrop/os_exchange_data_win_unittest.cc
diff --git a/ui/base/dragdrop/os_exchange_data_win_unittest.cc b/ui/base/dragdrop/os_exchange_data_win_unittest.cc
index c5b0ed5c4ff355039ed9f9990607b5b20a89dcc6..476eba95f5c8f3cac9e08e4cc33a0dc0428253e4 100644
--- a/ui/base/dragdrop/os_exchange_data_win_unittest.cc
+++ b/ui/base/dragdrop/os_exchange_data_win_unittest.cc
@@ -361,10 +361,10 @@ TEST(OSExchangeDataTest, TestPickledData) {
 TEST(OSExchangeDataTest, FileContents) {
   OSExchangeData data;
   std::string file_contents("data\0with\0nulls", 15);
-  data.SetFileContents(FilePath(L"filename.txt"), file_contents);
+  data.SetFileContents(base::FilePath(L"filename.txt"), file_contents);
 
   OSExchangeData copy(CloneProvider(data));
-  FilePath filename;
+  base::FilePath filename;
   std::string read_contents;
   EXPECT_TRUE(copy.GetFileContents(&filename, &read_contents));
   EXPECT_EQ(L"filename.txt", filename.value());