[WebLayer] Replace getActivity with getContext in PageInfo/SiteSettings

Replace usage of getContext() with getActivity() when it is used to
fetch resources to make SiteSettings and PageInfo work on WebLayer.


Bug: 1077766
Change-Id: I679d0e8ba991903d4fa055f01c88876c400fca46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2577212
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Robbie McElrath <rmcelrath@chromium.org>
Reviewed-by: Ehimare Okoyomon <eokoyomon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836116}

components/browser_ui/site_settings/android/java/src/org/chromium/components/browser_ui/site_settings/SiteSettings.java

@@ -96,7 +96,7 @@ public class SiteSettings
                     && SiteSettingsCategory
                                .createFromType(getSiteSettingsClient().getBrowserContextHandle(),
                                        prefCategory)
-                               .showPermissionBlockedMessage(getActivity())) {
+                               .showPermissionBlockedMessage(getContext())) {
                 // Show 'disabled' message when permission is not granted in Android.
                 p.setSummary(ContentSettingsResources.getCategorySummary(contentType, false));
             } else if (Type.COOKIES == prefCategory && checked

components/page_info/android/java/src/org/chromium/components/page_info/PageInfoCookiesPreference.java

@@ -95,7 +95,7 @@ public class PageInfoCookiesPreference extends PreferenceFragmentCompat {
         if (mDeleteDisabled || !mDataUsed) return;
 
         mConfirmationDialog =
-                new AlertDialog.Builder(getActivity(), R.style.Theme_Chromium_AlertDialog)
+                new AlertDialog.Builder(getContext(), R.style.Theme_Chromium_AlertDialog)
                         .setTitle(R.string.page_info_cookies_clear)
                         .setMessage(R.string.page_info_cookies_clear_confirmation)
                         .setPositiveButton(R.string.page_info_cookies_clear_confirmation_button,