Fix a bunch of mojo_public_*_unittests with the new EDK.

mojo/fetcher/data_fetcher_unittest.cc

 // Copyright 2015 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.
 
 #include "mojo/fetcher/data_fetcher.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 64 matching lines @@
     EXPECT_EQ(expected_status_code, response->status_code);
 
     if (expected_status_code != 200)
       return;
 
     ASSERT_TRUE(response->body.is_valid());
     EXPECT_EQ(expected_mime_type, response->mime_type);
 
     uint32_t num_bytes = 0;
     Handle body_handle = response->body.release();
+
+    MojoHandleSignalsState hss;
+    ASSERT_EQ(MOJO_RESULT_OK,
+              MojoWait(body_handle.value(), MOJO_HANDLE_SIGNAL_READABLE,
+                       MOJO_DEADLINE_INDEFINITE, &hss));
+
     MojoResult result = MojoReadData(body_handle.value(), nullptr, &num_bytes,
                                      MOJO_READ_DATA_FLAG_QUERY);
     ASSERT_EQ(MOJO_RESULT_OK, result);
 
     scoped_ptr<char[]> body(new char[num_bytes]);
     result = MojoReadData(body_handle.value(), body.get(), &num_bytes,
                           MOJO_READ_DATA_FLAG_ALL_OR_NONE);
     ASSERT_EQ(MOJO_RESULT_OK, result);
     EXPECT_EQ(expected_body, std::string(body.get(), num_bytes));
   }
 
  private:
   base::MessageLoop loop_;
 
   DISALLOW_COPY_AND_ASSIGN(DataFetcherTest);
 };
 
 TEST_F(DataFetcherTest, BasicSuccess) {
   TestFetchURL("data:text/html,Hello world", 200, "text/html", "Hello world");
 }
 
 TEST_F(DataFetcherTest, BasicFailure) {
   TestFetchURL("about:blank", 400, std::string(), std::string());
   TestFetchURL("data:;base64,aGVs_-_-", 400, std::string(), std::string());
 }
 
 }  // namespace
 }  // namespace fetcher
 }  // namespace mojo