[M51_2704] Chromium upversion to m51_2704 branch.

[M51_2704] Chromium upversion to m51_2704 branch.

This patch deals with the following changes:

1. Change in parameters of RunJavaScriptDialog() & RunBeforeUnloadDialog() functions
   of JavaScriptDialogManagerEfl.
2. WebGraphicsContext3DCommandBufferImpl constructor takes additional parameters
   gfx::PreferIntegratedGpu, share_resources & automatic_flushes. Also surface_id (int)
   is changed to SurfaceHandle.
3. Use gpu::gles2::ContextCreationAttribHelper in place of blink::WebGraphicsContext3D
   ::Attributes and initialize their members accordingly.
4. GpuChannelHost is moved from 'content' to 'gpu' namespace.
5. Context type BROWSER_COMPOSITOR_ONSCREEN_CONTEXT renamed to
   DISPLAY_COMPOSITOR_ONSCREEN_CONTEXT.
6. CommandBufferProxyImpl is moved from 'content' to 'gpu' namespace.
7. MovePluginWindows() of RenderWidgetHostView is removed is upstream.
8. ViewHostMsg_TextInputState_Params is renamed to TextInputState.
9. switches::kTabCaptureDownscaleQuality & switches::kTabCaptureUpscaleQuality are
   removed, hence SCALER_QUALITY is not dependant on these switches.
10. Change in parameter types for HandleNewWindowRequest() & HandleNewWebContentsCreate()
    functions due to scoped_refptr changes.
11. webplugin_delegate_impl.h is removed in upstream, hence remove related files from efl.
12. GpuChildThreadEfl constructor takes addtional parameter gpu::GpuPreferences.
13. Use switches::IsRunLayoutTestSwitchPresent() in place of HasSwitch(switches::kRunLayoutTest)
    as switches::kRunLayoutTest is no longer available.
14. media/ozone/media_ozone_platform.h is removed, hence remove related files from efl.
15. PermissionStatus is moved from content to blink::mojom:: namespace.
16. Include base/macros.h for DISALLOW_COPY_AND_ASSIGN macro.
17. Initialize BrowserContext with DIR_USER_DATA path before creation of RequestContext.
18. Overloaded CreateRequestContext() is replaced with CreateRequestContextForStoragePartition().
19. CookieStore & CookieMonster are no more ReferenceCounted hence use scoped_ptr and std::move
    during assignment and parameter passing.
20. NavigationController::ReloadIgnoringCache() is renamed to ReloadBypassingCache().
21. RenderProcessObserver::WebKitInitialized() is removed in upstream.
22. blink::WebFrameContentDumper::dumpFrameTreeAsText() is renamed to dumpWebViewAsText() which
    accepts WebView object instead of WebFrame.
23. setBaseBackgroundColor() is moved to WebFrameWidget.
24. 'network_delegate' member is removed from NetworkSessionParams.
25. Change in path for headers : gl_helper.h, command_buffer_proxy_impl.h, resize_lock.h,
    gpu_messages.h, gpu_host_messages.h, delegated_frame_host.h & permission_status.mojom.h
26. Version change from 50.2661 to 51.2704 in build and packaging related files.

AddExtraPluginDir() is removed from PluginListi class. The code under EWebContext::
AddExtraPluginDir() is disabled under EWK_BRINUP flag. This will be fixed by WebView team.
JIRA issue raised at http://suprem.sec.samsung.net/jira/browse/TWF-1132

Bug : http://suprem.sec.samsung.net/jira/browse/TWF-1060

Change-Id: I588d9c25c051dc72d76b7e6aa82d4a0f15ff01a2
Signed-off-by: Suchit Agrawal <a.suchit@samsung.com>