Clang/mac: Get unit_tests built.

chrome/common/child_process_logging_mac_unittest.mm

 // Copyright (c) 2009 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/common/child_process_logging.h"
 
 #import <Foundation/Foundation.h>
 
 #include "base/logging.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 60 matching lines @@
 
     NSString *expected_url = [NSString stringWithUTF8String:url.c_str()];
     return([accumulated_url isEqualToString:expected_url]);
   }
 
  private:
   static NSMutableDictionary* dict;
   DISALLOW_COPY_AND_ASSIGN(MockBreakpadKeyValueStore);
 };
 
+/* static */
+NSMutableDictionary* MockBreakpadKeyValueStore::dict;
+
 }  // namespace
 
 // Call through to SetActiveURLImpl using the functions from
 // MockBreakpadKeyValueStore.
 void SetActiveURLWithMock(const GURL& url) {
   using child_process_logging::SetActiveURLImpl;
 
   SetCrashKeyValueFuncPtr setFunc = MockBreakpadKeyValueStore::SetKeyValue;
   ClearCrashKeyValueFuncPtr clearFunc =
       MockBreakpadKeyValueStore::ClearKeyValue;
@@ skipping 38 matching lines @@
   EXPECT_EQ(mock.CountDictionaryEntries(), 0);
 
 
   // Check that overflow works correctly.
   SetActiveURLWithMock(GURL(overflow_url.c_str()));
   EXPECT_TRUE(mock.VerifyDictionaryContents(
       overflow_url.substr(0, max_num_chars_stored_in_dump)));
   SetActiveURLWithMock(GURL());
   EXPECT_EQ(mock.CountDictionaryEntries(), 0);
 }