Remove redundant c_str() calls.

chrome/browser/android/contextualsearch/ctr_suppression.cc

 // 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.
 
 #include <chrome/browser/android/contextualsearch/ctr_suppression.h>
 #include <set>
 
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
 #include "jni/CtrSuppression_jni.h"
@@ skipping 64 matching lines @@
 jfloat CtrSuppression::GetPrevious28DayCtr(JNIEnv* env,
                                            const JavaParamRef<jobject>& obj) {
   return aggregator_->GetPrevious28DayCtr();
 }
 
 // WeeklyActivityStorage overrides
 
 int CtrSuppression::ReadStorage(std::string storage_bucket) {
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jstring> j_storage_bucket =
-      ConvertUTF8ToJavaString(env, storage_bucket.c_str());
+      ConvertUTF8ToJavaString(env, storage_bucket);
   return Java_CtrSuppression_readInt(env, java_object_, j_storage_bucket);
 }
 
 void CtrSuppression::WriteStorage(std::string storage_bucket, int value) {
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jstring> j_storage_bucket =
-      ConvertUTF8ToJavaString(env, storage_bucket.c_str());
+      ConvertUTF8ToJavaString(env, storage_bucket);
   Java_CtrSuppression_writeInt(env, java_object_, j_storage_bucket, value);
 }
 
 // Java wrapper boilerplate
 
 void CtrSuppression::Destroy(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   delete this;
 }
 
 bool RegisterCtrSuppression(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 jlong Init(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   CtrSuppression* suppression = new CtrSuppression(env, obj);
   return reinterpret_cast<intptr_t>(suppression);
 }