base: Remove the string logging from CHECK().

components/display_compositor/yuv_readback_unittest.cc

Index: components/display_compositor/yuv_readback_unittest.cc
diff --git a/components/display_compositor/yuv_readback_unittest.cc b/components/display_compositor/yuv_readback_unittest.cc
index fe595e3364a996f698bca51a3454823b27149c29..27a3f9fc677682a03c96d365b09acb3114a96807 100644
--- a/components/display_compositor/yuv_readback_unittest.cc
+++ b/components/display_compositor/yuv_readback_unittest.cc
@@ -98,21 +98,21 @@ class YUVReadbackTest : public testing::Test {
     std::string error_msg;
     std::unique_ptr<base::Value> trace_data =
         base::JSONReader::ReadAndReturnError(json_data, 0, NULL, &error_msg);
-    CHECK(trace_data) << "JSON parsing failed (" << error_msg
-                      << ") JSON data:" << std::endl
-                      << json_data;
+    ASSERT_TRUE(trace_data) << "JSON parsing failed (" << error_msg
+                            << ") JSON data:" << std::endl
+                            << json_data;
 
     base::ListValue* list;
-    CHECK(trace_data->GetAsList(&list));
+    ASSERT_TRUE(trace_data->GetAsList(&list));
     for (size_t i = 0; i < list->GetSize(); i++) {
       base::Value* item = NULL;
       if (list->Get(i, &item)) {
         base::DictionaryValue* dict;
-        CHECK(item->GetAsDictionary(&dict));
+        ASSERT_TRUE(item->GetAsDictionary(&dict));
         std::string name;
-        CHECK(dict->GetString("name", &name));
+        ASSERT_TRUE(dict->GetString("name", &name));
         std::string trace_type;
-        CHECK(dict->GetString("ph", &trace_type));
+        ASSERT_TRUE(dict->GetString("ph", &trace_type));
         // Count all except END traces, as they come in BEGIN/END pairs.
         if (trace_type != "E" && trace_type != "e")
           (*event_counts)[name]++;