GN: Remove irrelevant targets for Cast Android build

build/gn_migration.gypi

Index: build/gn_migration.gypi
diff --git a/build/gn_migration.gypi b/build/gn_migration.gypi
index 370b256a6d8d7f16b774bd96b0264601c4671e58..ad910b038290e7622fb01aafb6012b076a1cd266 100644
--- a/build/gn_migration.gypi
+++ b/build/gn_migration.gypi
@@ -289,9 +289,6 @@
             '../base/base.gyp:chromium_android_linker',
             '../breakpad/breakpad.gyp:dump_syms',
             '../build/android/rezip.gyp:rezip_apk_jar',
-            '../chrome/chrome.gyp:chrome_public_apk',
-            '../chrome/chrome.gyp:chrome_public_test_apk',
-            '../chrome/chrome.gyp:chromedriver_webview_shell_apk',
             #"//clank" TODO(GYP) - conditional somehow?
             '../tools/imagediff/image_diff.gyp:image_diff#host',
             '../tools/telemetry/telemetry.gyp:bitmaptools#host',
@@ -354,6 +351,13 @@
             '../url/url.gyp:url_unittests',
           ],
         }],
+        ['OS=="android" and chromecast==0', {
+          'dependencies': [
+            '../chrome/chrome.gyp:chrome_public_apk',
+            '../chrome/chrome.gyp:chrome_public_test_apk',
+            '../chrome/chrome.gyp:chromedriver_webview_shell_apk',
+          ],
+        }],
         ['OS=="android" or OS=="linux"', {
           'dependencies': [
             '../net/net.gyp:disk_cache_memory_test',