Remove WebFileChooserParams::initialValue

On the Chromium side, FileSelectHelper::RunFileChooser asserts that
default filenames should only be specified for "Save" choosers. Blink
doesn't use those ("download" is a browser thing) so just remove
the field which would be ignored anyway. (Remembering the last used
directory is done through other means in the browser.)

BUG=632454,655298

Review-Url: https://codereview.chromium.org/2446743002
Cr-Commit-Position: refs/heads/master@{#427814}
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index d95eef9..9b4542e7 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -674,6 +674,14 @@
   // process; for layout tests, this allows the test to mock out services at
   // the Mojo IPC layer.
   void MaybeEnableMojoBindings();
+  // Adds the given file chooser request to the file_chooser_completion_ queue
+  // (see that var for more) and requests the chooser be displayed if there are
+  // no other waiting items in the queue.
+  //
+  // Returns true if the chooser was successfully scheduled. False means we
+  // didn't schedule anything.
+  bool ScheduleFileChooser(const FileChooserParams& params,
+                           blink::WebFileChooserCompletion* completion);
 
   // Plugin-related functions --------------------------------------------------
 
@@ -940,15 +948,6 @@
                             const GURL& frame_url,
                             base::string16* result);
 
-  // Adds the given file chooser request to the file_chooser_completion_ queue
-  // (see that var for more) and requests the chooser be displayed if there are
-  // no other waiting items in the queue.
-  //
-  // Returns true if the chooser was successfully scheduled. False means we
-  // didn't schedule anything.
-  bool ScheduleFileChooser(const FileChooserParams& params,
-                           blink::WebFileChooserCompletion* completion);
-
   // Loads the appropriate error page for the specified failure into the frame.
   // |entry| is only used by PlzNavigate when navigating to a history item.
   void LoadNavigationErrorPage(const blink::WebURLRequest& failed_request,