Move Color Picker Plumbing From WebViewGuest to GuestViewBase

This allows all GuestView types to have access to a color picker.

BUG=451737

Review URL: https://codereview.chromium.org/889873004

Cr-Commit-Position: refs/heads/master@{#314035}

extensions/browser/guest_view/guest_view_base.cc

@@ -593,6 +593,17 @@ void GuestViewBase::LoadingStateChanged(content::WebContents* source,
       embedder_web_contents(), to_different_document);
 }
 
+content::ColorChooser* GuestViewBase::OpenColorChooser(
+    WebContents* web_contents,
+    SkColor color,
+    const std::vector<content::ColorSuggestion>& suggestions) {
+  if (!attached() || !embedder_web_contents()->GetDelegate())
+    return nullptr;
+
+  return embedder_web_contents()->GetDelegate()->OpenColorChooser(
+      web_contents, color, suggestions);
+}
+
 void GuestViewBase::RunFileChooser(WebContents* web_contents,
                                    const content::FileChooserParams& params) {
   if (!attached() || !embedder_web_contents()->GetDelegate())

extensions/browser/guest_view/guest_view_base.h

@@ -310,6 +310,10 @@ class GuestViewBase : public content::BrowserPluginGuestDelegate,
       const content::NativeWebKeyboardEvent& event) override;
   void LoadingStateChanged(content::WebContents* source,
                            bool to_different_document) final;
+  content::ColorChooser* OpenColorChooser(
+      content::WebContents* web_contents,
+      SkColor color,
+      const std::vector<content::ColorSuggestion>& suggestions) override;
   void RunFileChooser(content::WebContents* web_contents,
                       const content::FileChooserParams& params) override;
   bool ShouldFocusPageAfterCrash() final;

extensions/browser/guest_view/web_view/web_view_guest.cc

@@ -861,16 +861,6 @@ content::JavaScriptDialogManager* WebViewGuest::GetJavaScriptDialogManager(
   return &javascript_dialog_helper_;
 }
 
-content::ColorChooser* WebViewGuest::OpenColorChooser(
-    WebContents* web_contents,
-    SkColor color,
-    const std::vector<content::ColorSuggestion>& suggestions) {
-  if (!attached() || !embedder_web_contents()->GetDelegate())
-    return nullptr;
-  return embedder_web_contents()->GetDelegate()->OpenColorChooser(
-      web_contents, color, suggestions);
-}
-
 void WebViewGuest::NavigateGuest(const std::string& src,
                                  bool force_navigation) {
   if (src.empty())

extensions/browser/guest_view/web_view/web_view_guest.h

@@ -145,10 +145,6 @@ class WebViewGuest : public GuestView<WebViewGuest>,
                    const base::Callback<void(bool)>& callback) override;
   content::JavaScriptDialogManager* GetJavaScriptDialogManager(
       content::WebContents* source) override;
-  content::ColorChooser* OpenColorChooser(
-      content::WebContents* web_contents,
-      SkColor color,
-      const std::vector<content::ColorSuggestion>& suggestions) override;
   void AddNewContents(content::WebContents* source,
                       content::WebContents* new_contents,
                       WindowOpenDisposition disposition,