base: Remove the string logging from CHECK().

cc/debug/invalidation_benchmark.cc

Index: cc/debug/invalidation_benchmark.cc
diff --git a/cc/debug/invalidation_benchmark.cc b/cc/debug/invalidation_benchmark.cc
index 3923c14a3b7cfec293a7ab8929eedc600ab5e6ec..f75175ae84097897d106bcc9f0f070199b6f3fe1 100644
--- a/cc/debug/invalidation_benchmark.cc
+++ b/cc/debug/invalidation_benchmark.cc
@@ -42,10 +42,10 @@ InvalidationBenchmark::InvalidationBenchmark(
 
   if (mode_string == "fixed_size") {
     mode_ = FIXED_SIZE;
-    CHECK(settings->HasKey("width"))
-        << "Must provide a width for fixed_size mode.";
-    CHECK(settings->HasKey("height"))
-        << "Must provide a height for fixed_size mode.";
+    // Must provide a width for fixed_size mode.
+    CHECK(settings->HasKey("width"));
+    // Must provide a height for fixed_size mode.
+    CHECK(settings->HasKey("height"));
     settings->GetInteger("width", &width_);
     settings->GetInteger("height", &height_);
   } else if (mode_string == "layer") {
@@ -55,8 +55,7 @@ InvalidationBenchmark::InvalidationBenchmark(
   } else if (mode_string == "viewport") {
     mode_ = VIEWPORT;
   } else {
-    CHECK(false) << "Invalid mode: " << mode_string
-                 << ". One of {fixed_size, layer, viewport, random} expected.";
+    CHECK(false);
   }
 }