Move JavaScriptDialogManager, JavascriptAppModalDialogViews to components/app_modal_dialogs.

(I first tried to move cocoa/android impl, but it turns out to be more difficult than I originally thought so I left them as they are)

Introduced JavaScriptDialogManagerClient for embedder to implement extensions related behaviors.

BUG=410499
TBR=blundell@chromium.org

Review URL: https://codereview.chromium.org/666533007

Cr-Commit-Position: refs/heads/master@{#303004}

1 files changed, 4 insertions, 0 deletions

diff --git a/components/BUILD.gn b/components/BUILD.gn
index 3ba3272..ca08f6e 100644
--- a/components/BUILD.gn
+++ b/components/BUILD.gn
@@ -195,6 +195,10 @@ group("all_components") {
     ]
   }
 
+  if (!is_ios) {
+    deps += [ "//components/app_modal_dialogs" ]
+  }
+
   if (toolkit_views) {
     deps += [ "//components/constrained_window" ]
   }