Don't call WebCacheManager::Remove(RPH_id) to clear webview's cache.

chrome/test/data/extensions/platform_apps/web_view/common/cleardata_twice/bootstrap.js

Index: chrome/test/data/extensions/platform_apps/web_view/common/cleardata_twice/bootstrap.js
diff --git a/chrome/test/data/extensions/platform_apps/web_view/common/cleardata_twice/bootstrap.js b/chrome/test/data/extensions/platform_apps/web_view/common/cleardata_twice/bootstrap.js
new file mode 100644
index 0000000000000000000000000000000000000000..289c052a3438c43fb6ef4be4fe16e266bee4f46c
--- /dev/null
+++ b/chrome/test/data/extensions/platform_apps/web_view/common/cleardata_twice/bootstrap.js
@@ -0,0 +1,43 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+config.IS_CHROME_TEST = true;
+// Guest served from TestServer.
+config.IS_JS_ONLY_GUEST = false;
+config.TEST_DIR = 'cleardata_twice';
+
+var clearDataTwiceTests = {};
+
+var run = function() {
+  var container = document.createElement('div');
+  container.id = 'webview-tag-container';
+  document.body.appendChild(container);
+
+  chrome.test.getConfig(function(chromeConfig) {
+    window.console.log('getConfig: ' + chromeConfig);
+    utils.setUp(chromeConfig, config);
+    embedder.loadGuest(function() {
+      chrome.test.runTests([
+        clearDataTwiceTests.clear
+      ]);
+    }, function(data) {
+      // We don't expect guest to send us any postMessage.
+      chrome.test.fail();
+    });
+  });
+};
+
+// Tests.
+// Clears http cache of a webview twice.
+clearDataTwiceTests.clear = function testClearDataTwice() {
+  console.log('clearDataTwiceTests.clear');
+  embedder.webview.clearData({}, {cache: true}, function() {
+    embedder.webview.clearData({}, {cache: true}, function() {
+      chrome.test.succeed();
+    });
+  });
+};
+
+// Run test(s).
+run();