Update to Chromium revision 6e53600d (#386251)

- Remove |accept_lang| parameter from CefJSDialogHandler::OnJSDialog
  and CefFormatUrlForSecurityDisplay (see https://crbug.com/336973#c36).
- Remove remaining NPAPI-related code including functions from
  cef_web_plugin.h (see https://crbug.com/493212#c55).
- Mac: 10.7+ deployment target is now required for client applications.
- Mac: Remove CefBrowserHost::SetWindowVisibility (issue #1375). No
  replacement is required for windowed rendering. Use WasHidden for
  off-screen rendering.
- Windows: Visual Studio 2015 Update 2 is now required when building
  CEF/Chromium.

patch/patches/views_1749.patch

@@ -1,5 +1,5 @@
 diff --git controls/button/menu_button.cc controls/button/menu_button.cc
-index 41921b9..a9c2e79 100644
+index 4d1a1b9..7854bb0 100644
 --- controls/button/menu_button.cc
 +++ controls/button/menu_button.cc
 @@ -199,7 +199,7 @@ void MenuButton::OnPaint(gfx::Canvas* canvas) {
@@ -56,7 +56,7 @@ index 696a941..ce5abcd 100644
    // The time is used for simulating menu behavior for the menu button; that
    // is, if the menu is shown and the button is pressed, we need to close the
 diff --git view.h view.h
-index 897160e..415f194 100644
+index a85ef3d..42bd451 100644
 --- view.h
 +++ view.h
 @@ -18,6 +18,7 @@
@@ -67,7 +67,7 @@ index 897160e..415f194 100644
  #include "build/build_config.h"
  #include "ui/accessibility/ax_enums.h"
  #include "ui/base/accelerators/accelerator.h"
-@@ -111,7 +112,8 @@ class VIEWS_EXPORT View : public ui::LayerDelegate,
+@@ -112,7 +113,8 @@ class VIEWS_EXPORT View : public ui::LayerDelegate,
                            public ui::LayerOwner,
                            public ui::AcceleratorTarget,
                            public ui::EventTarget,