[WebView] Reorganize all of the WebView Shell apks into their own dir.

Thought I could clean up the android_webview/tools dir a little bit.
It basically has some random tools as well as the WebViewShell apks
so I moved all the apks into a shared folder.

- Moved all WebViewShell Apks into tools/system_webview_shell
- Moved WebViewShell/test/ to system_webview_shell/test/data/ to better
match the naming of test data elsewhere
- Removed DEPRECATED_java_in_dir from tools/BUILD.gn.
- Updated gn_migration.gypi since GN targets exist for the WebView
Shell apks.

BUG=

Review URL: https://codereview.chromium.org/1785283005

Cr-Commit-Position: refs/heads/master@{#382390}

1 files changed, 1 insertions, 1 deletions

diff --git a/BUILD.gn b/BUILD.gn
index 8fbd05c..52bb985 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -309,7 +309,7 @@ group("both_gn_and_gyp") {
       deps += [
         "//android_webview",
         "//android_webview/test",
-        "//android_webview/tools",
+        "//android_webview/tools/system_webview_shell",
         "//chrome/android:chrome_junit_tests",
         "//chrome/android:chrome_public_apk",
         "//chrome/android:chrome_public_test_apk",