customtabs: Load the SharedPreferences only once, in the background.

chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java

Index: chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
index 0caac7e5c9188b3a15bcb983f685df6eb3c95b96..abaf00b0992b81759bd0696bf07b42b902a74fcd 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
@@ -267,7 +267,6 @@ public class CustomTabsConnection {
         if (!isCallerForegroundOrSelf()) return false;
         mClientManager.recordUidHasCalledWarmup(Binder.getCallingUid());
         final boolean initialized = !mWarmupHasBeenCalled.compareAndSet(false, true);
-        final int uid = Binder.getCallingUid();
         // The call is non-blocking and this must execute on the UI thread, post a task.
         ThreadUtils.postOnUiThread(new Runnable() {
             @Override
@@ -299,7 +298,7 @@ public class CustomTabsConnection {
                         // The throttling database uses shared preferences, that can cause a
                         // StrictMode violation on the first access. Make sure that this access is
                         // not in mayLauchUrl.
-                        RequestThrottler.getForUid(mApplication, uid);
+                        RequestThrottler.loadInBackground(mApplication);
                     }
                 } finally {
                     TraceEvent.end("CustomTabsConnection.warmupInternal");