Use base namespace for FilePath in content/browser

content/browser/web_contents/web_drag_source_mac.mm

Index: content/browser/web_contents/web_drag_source_mac.mm
diff --git a/content/browser/web_contents/web_drag_source_mac.mm b/content/browser/web_contents/web_drag_source_mac.mm
index b59be11d66d00f86b4e99bf3d9b3cea1a7438307..f371dcb6dacdd7978b7fdd1c71665214eba3f6cf 100644
--- a/content/browser/web_contents/web_drag_source_mac.mm
+++ b/content/browser/web_contents/web_drag_source_mac.mm
@@ -51,19 +51,20 @@ NSString* const kNSURLTitlePboardType = @"public.url-name";
 // Converts a string16 into a FilePath. Use this method instead of
 // -[NSString fileSystemRepresentation] to prevent exceptions from being thrown.
 // See http://crbug.com/78782 for more info.
-FilePath FilePathFromFilename(const string16& filename) {
+base::FilePath FilePathFromFilename(const string16& filename) {
   NSString* str = SysUTF16ToNSString(filename);
   char buf[MAXPATHLEN];
   if (![str getFileSystemRepresentation:buf maxLength:sizeof(buf)])
-    return FilePath();
-  return FilePath(buf);
+    return base::FilePath();
+  return base::FilePath(buf);
 }
 
 // Returns a filename appropriate for the drop data
 // TODO(viettrungluu): Refactor to make it common across platforms,
 // and move it somewhere sensible.
-FilePath GetFileNameFromDragData(const WebDropData& drop_data) {
-  FilePath file_name(FilePathFromFilename(drop_data.file_description_filename));
+base::FilePath GetFileNameFromDragData(const WebDropData& drop_data) {
+  base::FilePath file_name(
+      FilePathFromFilename(drop_data.file_description_filename));
 
   // Images without ALT text will only have a file extension so we need to
   // synthesize one from the provided extension and URL.
@@ -318,9 +319,9 @@ void PromiseWriterHelper(const WebDropData& drop_data,
     return nil;
   }
 
-  FilePath fileName = downloadFileName_.empty() ?
+  base::FilePath fileName = downloadFileName_.empty() ?
       GetFileNameFromDragData(*dropData_) : downloadFileName_;
-  FilePath filePath(SysNSStringToUTF8(path));
+  base::FilePath filePath(SysNSStringToUTF8(path));
   filePath = filePath.Append(fileName);
 
   // CreateFileStreamForDrop() will call file_util::PathExists(),
@@ -388,7 +389,7 @@ void PromiseWriterHelper(const WebDropData& drop_data,
       net::GetMimeTypeFromExtension(fileExtension, &mimeType);
     } else {
       string16 mimeType16;
-      FilePath fileName;
+      base::FilePath fileName;
       if (content::ParseDownloadMetadata(
               dropData_->download_metadata,
               &mimeType16,