[Android WebView] Never turn off viewport and fixed layout

android_webview/common/render_view_messages.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Multiply-included file, no traditional include guard.
 #include "android_webview/common/aw_hit_test_data.h"
 #include "content/public/common/common_param_traits.h"
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_platform_file.h"
@@ skipping 51 matching lines @@
 // Sets the zoom level for text only. Used in layout modes other than
 // Text Autosizing.
 IPC_MESSAGE_ROUTED1(AwViewMsg_SetTextZoomLevel,
                     double /* zoom_level */)
 
 // Resets WebKit WebView scrolling and scale state. We need to send this
 // message whenever we want to guarantee that page's scale will be
 // recalculated by WebKit.
 IPC_MESSAGE_ROUTED0(AwViewMsg_ResetScrollAndScaleState)
 
-// Set whether fixed layout mode is enabled. Must be updated together
-// with WebSettings.viewport_enabled. Only WebView switches this mode
-// dynamically, thus there is no support for this in the common code.
-IPC_MESSAGE_ROUTED1(AwViewMsg_SetEnableFixedLayoutMode,
-                    bool /* enabled */)
-
 // Sets the initial page scale. This overrides initial scale set by
 // the meta viewport tag.
 IPC_MESSAGE_ROUTED1(AwViewMsg_SetInitialPageScale,
                     double /* page_scale_factor */)
 
 //-----------------------------------------------------------------------------
 // RenderView messages
 // These are messages sent from the renderer to the browser process.
 
 // Response to AwViewMsg_DocumentHasImages request.
 IPC_MESSAGE_ROUTED2(AwViewHostMsg_DocumentHasImagesResponse,
                     int, /* id */
                     bool /* has_images */)
 
 // Response to AwViewMsg_DoHitTest.
 IPC_MESSAGE_ROUTED1(AwViewHostMsg_UpdateHitTestData,
                     android_webview::AwHitTestData)
 
 // Notification that a new picture becomes available. It is only sent if
 // AwViewMsg_EnableCapturePictureCallback was previously enabled.
 IPC_MESSAGE_ROUTED0(AwViewHostMsg_PictureUpdated)
 
 // Sent by the renderer when accelerated compositing is enabled, allowing the
 // browser to perform synchronous input event filtering.
 IPC_MESSAGE_ROUTED1(AwViewHostMsg_DidActivateAcceleratedCompositing,
                     int /* input_handler_id */)