Update to Chromium revision 304f01a1 (#358063)

- Improve ordering of CefLoadHandler callbacks. OnLoadingStateChange will
  be called before and after all calls to OnLoadStart and OnLoadEnd.
  OnLoadStart/OnLoadEnd calls will occur as matching pairs
  (see http://crbug.com/539952#c2).
- Remove the |requesting_url| argument to CefGeolocationHandler::
  OnCancelGeolocationPermission. Clients can use the |request_id| argument
  to track this information themselves.
- Fix a crash when loading the PDF extension in multiple browsers with a
  custom CefRequestContext (issue #1757).

patch/patches/chrome_browser_1257.patch

@@ -1,8 +1,8 @@
 diff --git ui/browser.cc ui/browser.cc
-index 36d24b6..bbc5075 100644
+index d6a2493..c352fd6a 100644
 --- ui/browser.cc
 +++ ui/browser.cc
-@@ -1669,7 +1669,9 @@ bool Browser::ShouldCreateWebContents(
+@@ -1673,7 +1673,9 @@ bool Browser::ShouldCreateWebContents(
      const std::string& frame_name,
      const GURL& target_url,
      const std::string& partition_id,
@@ -12,9 +12,9 @@ index 36d24b6..bbc5075 100644
 +    content::RenderViewHostDelegateView** delegate_view) {
    if (window_container_type == WINDOW_CONTAINER_TYPE_BACKGROUND) {
      // If a BackgroundContents is created, suppress the normal WebContents.
-     return !MaybeCreateBackgroundContents(route_id,
+     return !MaybeCreateBackgroundContents(
 diff --git ui/browser.h ui/browser.h
-index e296569..bf03785 100644
+index 1511788..23ffe53 100644
 --- ui/browser.h
 +++ ui/browser.h
 @@ -591,7 +591,9 @@ class Browser : public TabStripModelObserver,