Remove getApplicationContext calls from /content/public/

Continuation of work in bug 646094.

Preparing to activate an errorprone check to flag
context#getApplicationContext calls. The goal is to prevent storing the
resulting context as a class property, and instead use ContextUtils.

Bug: 846456
Change-Id: I059c13769179010146530e75b554acc29260abaa
Reviewed-on: https://chromium-review.googlesource.com/1140511Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Commit-Queue: Tiger Oakes <tigero@google.com>
Cr-Commit-Position: refs/heads/master@{#575752}

content/public/android/java/src/org/chromium/content/browser/accessibility/LollipopWebContentsAccessibility.java

@@ -18,6 +18,7 @@ import android.view.accessibility.AccessibilityEvent;
 import android.view.accessibility.AccessibilityNodeInfo;
 import android.view.accessibility.AccessibilityNodeInfo.AccessibilityAction;
 
+import org.chromium.base.ContextUtils;
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.content_public.browser.WebContents;
 
@@ -159,7 +160,7 @@ public class LollipopWebContentsAccessibility extends KitKatWebContentsAccessibi
     public void onDetachedFromWindow() {
         super.onDetachedFromWindow();
         if (!isNativeInitialized()) return;
-        mContext.getApplicationContext().unregisterReceiver(mBroadcastReceiver);
+        ContextUtils.getApplicationContext().unregisterReceiver(mBroadcastReceiver);
     }
 
     @Override
@@ -172,7 +173,7 @@ public class LollipopWebContentsAccessibility extends KitKatWebContentsAccessibi
         if (!isNativeInitialized()) return;
         try {
             IntentFilter filter = new IntentFilter(Intent.ACTION_LOCALE_CHANGED);
-            mContext.getApplicationContext().registerReceiver(mBroadcastReceiver, filter);
+            ContextUtils.getApplicationContext().registerReceiver(mBroadcastReceiver, filter);
         } catch (ReceiverCallNotAllowedException e) {
             // WebView may be running inside a BroadcastReceiver, in which case registerReceiver is
             // not allowed.

content/public/android/java/src/org/chromium/content/browser/accessibility/WebContentsAccessibilityImpl.java

@@ -163,7 +163,7 @@ public class WebContentsAccessibilityImpl extends AccessibilityNodeProvider
         mProductVersion = productVersion;
         mAccessibilityManager =
                 (AccessibilityManager) mContext.getSystemService(Context.ACCESSIBILITY_SERVICE);
-        mCaptioningController = new CaptioningController(mWebContents, mContext);
+        mCaptioningController = new CaptioningController(mWebContents);
         WindowEventObserverManager.from(mWebContents).addObserver(this);
 
         mInitialized = true;

content/public/android/java/src/org/chromium/content/browser/accessibility/captioning/CaptioningBridgeFactory.java

@@ -4,7 +4,6 @@
 
 package org.chromium.content.browser.accessibility.captioning;
 
-import android.content.Context;
 import android.os.Build;
 
 /**
@@ -15,12 +14,11 @@ public class CaptioningBridgeFactory {
     /**
      * Create and return the best SystemCaptioningBridge available.
      *
-     * @param context Context associated with the activity.
      * @return the best SystemCaptioningBridge available.
      */
-    public static SystemCaptioningBridge getSystemCaptioningBridge(Context context) {
+    public static SystemCaptioningBridge getSystemCaptioningBridge() {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
-            return KitKatCaptioningBridge.getInstance(context);
+            return KitKatCaptioningBridge.getInstance();
         }
         // On older systems, return a CaptioningBridge that does nothing.
         return new EmptyCaptioningBridge();

content/public/android/java/src/org/chromium/content/browser/accessibility/captioning/CaptioningController.java

@@ -5,7 +5,6 @@
 package org.chromium.content.browser.accessibility.captioning;
 
 import android.annotation.TargetApi;
-import android.content.Context;
 import android.os.Build;
 
 import org.chromium.base.annotations.CalledByNative;
@@ -20,8 +19,8 @@ public class CaptioningController implements SystemCaptioningBridge.SystemCaptio
     private SystemCaptioningBridge mSystemCaptioningBridge;
     private long mNativeCaptioningController;
 
-    public CaptioningController(WebContents webContents, Context context) {
-        mSystemCaptioningBridge = CaptioningBridgeFactory.getSystemCaptioningBridge(context);
+    public CaptioningController(WebContents webContents) {
+        mSystemCaptioningBridge = CaptioningBridgeFactory.getSystemCaptioningBridge();
         mNativeCaptioningController = nativeInit(webContents);
     }
 

content/public/android/java/src/org/chromium/content/browser/accessibility/captioning/KitKatCaptioningBridge.java

@@ -9,6 +9,8 @@ import android.content.Context;
 import android.os.Build;
 import android.view.accessibility.CaptioningManager;
 
+import org.chromium.base.ContextUtils;
+
 import java.util.Locale;
 
 /**
@@ -58,22 +60,20 @@ public class KitKatCaptioningBridge implements SystemCaptioningBridge {
      * @param context the Context to associate with this bridge.
      * @return the singleton instance of KitKatCaptioningBridge.
      */
-    public static KitKatCaptioningBridge getInstance(Context context) {
+    public static KitKatCaptioningBridge getInstance() {
         if (sKitKatCaptioningBridge == null) {
-            sKitKatCaptioningBridge = new KitKatCaptioningBridge(context);
+            sKitKatCaptioningBridge = new KitKatCaptioningBridge();
         }
         return sKitKatCaptioningBridge;
     }
 
     /**
      * Construct a new KitKat+ captioning bridge
-     *
-     * @param context the Context to associate with this bridge.
      */
-    private KitKatCaptioningBridge(Context context) {
+    private KitKatCaptioningBridge() {
         mCaptioningChangeDelegate = new CaptioningChangeDelegate();
         mCaptioningManager =
-                (CaptioningManager) context.getApplicationContext().getSystemService(
+                (CaptioningManager) ContextUtils.getApplicationContext().getSystemService(
                         Context.CAPTIONING_SERVICE);
     }