Add support for file inputs for all guest views

Implement WebContentsDelegate::RunFileChooser in GuestViewBase
so that <input type=file> tags will work correctly within  guest views.

BUG=409339

Review URL: https://codereview.chromium.org/531963002

Cr-Commit-Position: refs/heads/master@{#293044}

extensions/browser/guest_view/guest_view_base.cc

@@ -383,6 +383,14 @@ void GuestViewBase::WebContentsDestroyed() {
   delete this;
 }
 
+void GuestViewBase::RunFileChooser(WebContents* web_contents,
+                                   const content::FileChooserParams& params) {
+  if (!attached() || !embedder_web_contents()->GetDelegate())
+    return;
+
+  embedder_web_contents()->GetDelegate()->RunFileChooser(web_contents, params);
+}
+
 bool GuestViewBase::ShouldFocusPageAfterCrash() {
   // Focus is managed elsewhere.
   return false;

extensions/browser/guest_view/guest_view_base.h

@@ -278,6 +278,9 @@ class GuestViewBase : public content::BrowserPluginGuestDelegate,
   virtual void WebContentsDestroyed() OVERRIDE FINAL;
 
   // WebContentsDelegate implementation.
+  virtual void RunFileChooser(
+      content::WebContents* web_contents,
+      const content::FileChooserParams& params) OVERRIDE;
   virtual bool ShouldFocusPageAfterCrash() OVERRIDE FINAL;
   virtual bool PreHandleGestureEvent(
       content::WebContents* source,

extensions/browser/guest_view/web_view/web_view_guest.cc

@@ -837,14 +837,6 @@ content::ColorChooser* WebViewGuest::OpenColorChooser(
       web_contents, color, suggestions);
 }
 
-void WebViewGuest::RunFileChooser(WebContents* web_contents,
-                                  const content::FileChooserParams& params) {
-  if (!attached() || !embedder_web_contents()->GetDelegate())
-    return;
-
-  embedder_web_contents()->GetDelegate()->RunFileChooser(web_contents, params);
-}
-
 void WebViewGuest::NavigateGuest(const std::string& src) {
   GURL url = ResolveURL(src);
 

extensions/browser/guest_view/web_view/web_view_guest.h

@@ -131,9 +131,6 @@ class WebViewGuest : public GuestView<WebViewGuest>,
       content::WebContents* web_contents,
       SkColor color,
       const std::vector<content::ColorSuggestion>& suggestions) OVERRIDE;
-  virtual void RunFileChooser(
-      content::WebContents* web_contents,
-      const content::FileChooserParams& params) OVERRIDE;
   virtual void AddNewContents(content::WebContents* source,
                               content::WebContents* new_contents,
                               WindowOpenDisposition disposition,