Simplify WebUI data sources. Currently WebUI data sources implement a URLDataSourceDelegate interfa…

chrome/browser/ui/webui/favicon_source.cc

Index: chrome/browser/ui/webui/favicon_source.cc
===================================================================
--- chrome/browser/ui/webui/favicon_source.cc	(revision 176942)
+++ chrome/browser/ui/webui/favicon_source.cc	(working copy)
@@ -9,7 +9,6 @@
 #include "chrome/browser/favicon/favicon_service_factory.h"
 #include "chrome/browser/history/top_sites.h"
 #include "chrome/browser/profiles/profile.h"
-#include "chrome/browser/ui/webui/chrome_url_data_manager.h"
 #include "chrome/browser/ui/webui/web_ui_util.h"
 #include "chrome/common/url_constants.h"
 #include "grit/locale_settings.h"
@@ -18,6 +17,25 @@
 #include "ui/base/layout.h"
 #include "ui/base/resource/resource_bundle.h"
 
+FaviconSource::IconRequest::IconRequest()
+    : size_in_dip(gfx::kFaviconSize),
+      scale_factor(ui::SCALE_FACTOR_NONE) {
+}
+
+FaviconSource::IconRequest::IconRequest(
+    const content::URLDataSource::GotDataCallback& cb,
+    const std::string& path,
+    int size,
+    ui::ScaleFactor scale)
+    : callback(cb),
+      request_path(path),
+      size_in_dip(size),
+      scale_factor(scale) {
+}
+
+FaviconSource::IconRequest::~IconRequest() {
+}
+
 FaviconSource::FaviconSource(Profile* profile, IconType type)
     : profile_(profile->GetOriginalProfile()),
       icon_types_(type == FAVICON ? history::FAVICON :
@@ -33,13 +51,14 @@
       chrome::kChromeUIFaviconHost : chrome::kChromeUITouchIconHost;
 }
 
-void FaviconSource::StartDataRequest(const std::string& path,
-                                     bool is_incognito,
-                                     int request_id) {
+void FaviconSource::StartDataRequest(
+    const std::string& path,
+    bool is_incognito,
+    const content::URLDataSource::GotDataCallback& callback) {
   FaviconService* favicon_service =
       FaviconServiceFactory::GetForProfile(profile_, Profile::EXPLICIT_ACCESS);
   if (!favicon_service || path.empty()) {
-    SendDefaultResponse(IconRequest(request_id,
+    SendDefaultResponse(IconRequest(callback,
                                     "",
                                     16,
                                     ui::SCALE_FACTOR_100P));
@@ -68,7 +87,7 @@
         scale_factor,
         base::Bind(&FaviconSource::OnFaviconDataAvailable,
                    base::Unretained(this),
-                   IconRequest(request_id,
+                   IconRequest(callback,
                                path.substr(prefix_length),
                                size_in_dip,
                                scale_factor)),
@@ -115,7 +134,7 @@
     for (size_t i = 0; i < arraysize(history::kPrepopulatedPages); i++) {
       if (url.spec() ==
           l10n_util::GetStringUTF8(history::kPrepopulatedPages[i].url_id)) {
-        url_data_source()->SendResponse(request_id,
+        callback.Run(
             ResourceBundle::GetSharedInstance().LoadDataResourceBytesForScale(
                 history::kPrepopulatedPages[i].favicon_id,
                 scale_factor));
@@ -129,7 +148,7 @@
         scale_factor,
         base::Bind(&FaviconSource::OnFaviconDataAvailable,
                    base::Unretained(this),
-                   IconRequest(request_id,
+                   IconRequest(callback,
                                url.spec(),
                                size_in_dip,
                                scale_factor)),
@@ -160,8 +179,7 @@
     const history::FaviconBitmapResult& bitmap_result) {
   if (bitmap_result.is_valid()) {
     // Forward the data along to the networking system.
-    url_data_source()->SendResponse(
-        request.request_id, bitmap_result.bitmap_data);
+    request.callback.Run(bitmap_result.bitmap_data);
   } else if (!HandleMissingResource(request)) {
     SendDefaultResponse(request);
   }
@@ -193,5 +211,5 @@
     default_favicons_[favicon_index] = default_favicon;
   }
 
-  url_data_source()->SendResponse(icon_request.request_id, default_favicon);
+  icon_request.callback.Run(default_favicon);
 }