Do not initialize std::string to empty string.

Clean up base, chrome, and content. Do the same for base::string16 and
std::wstring.

Change-Id: If513d114ac0fee151f9ae2f21261c477761b7a3c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2181525
Commit-Queue: Lei Zhang <[email protected]>
Reviewed-by: Avi Drissman <[email protected]>
Cr-Commit-Position: refs/heads/master@{#765751}
diff --git a/chrome/browser/android/shortcut_helper.cc b/chrome/browser/android/shortcut_helper.cc
index cd45a0a..f373544 100644
--- a/chrome/browser/android/shortcut_helper.cc
+++ b/chrome/browser/android/shortcut_helper.cc
@@ -320,7 +320,7 @@
   ScopedJavaLocalRef<jstring> java_webapk_package_name =
       Java_ShortcutHelper_queryFirstWebApkPackage(env, java_url);
 
-  std::string webapk_package_name = "";
+  std::string webapk_package_name;
   if (java_webapk_package_name.obj()) {
     webapk_package_name =
         base::android::ConvertJavaStringToUTF8(env, java_webapk_package_name);