Prepare base/ for compilation with OS X 10.7 deployment target.

base/mac/sdk_forward_declarations.h

 // Copyright (c) 2012 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.
 
 // This file contains forward declarations for items in later SDKs than the
 // default one with which Chromium is built (currently 10.6).
 // If you call any function from this header, be sure to check at runtime for
 // respondsToSelector: before calling these functions (else your code will crash
 // on older OS X versions that chrome still supports).
 
@@ skipping 275 matching lines @@
 // version of the OSX SDK, redeclare those same functions to suppress
 // -Wpartial-availability warnings.
 // ----------------------------------------------------------------------------
 
 // Once Chrome no longer supports OSX 10.6, everything within this preprocessor
 // block can be removed.
 #if !defined(MAC_OS_X_VERSION_10_7) || \
     MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_7
 
 @interface NSEvent (LionSDK)
-@property(readonly) NSInteger stage;
 + (BOOL)isSwipeTrackingFromScrollEventsEnabled;
 - (NSEventPhase)momentumPhase;
 - (NSEventPhase)phase;
 - (BOOL)hasPreciseScrollingDeltas;
 - (CGFloat)scrollingDeltaX;
 - (CGFloat)scrollingDeltaY;
 - (void)trackSwipeEventWithOptions:(NSEventSwipeTrackingOptions)options
           dampenAmountThresholdMin:(CGFloat)minDampenThreshold
                                max:(CGFloat)maxDampenThreshold
                       usingHandler:(void (^)(CGFloat gestureAmount,
@@ skipping 228 matching lines @@
 - (void)setTitlebarAppearsTransparent:(BOOL)flag;
 @end
 
 #endif  // MAC_OS_X_VERSION_10_10
 
 // Once Chrome no longer supports OSX 10.10.2, everything within this
 // preprocessor block can be removed.
 #if !defined(MAC_OS_X_VERSION_10_10_3) || \
     MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_10_3
 
+@interface NSEvent (YosemiteSDK)
+@property(readonly) NSInteger stage;
+@end
+
 @interface NSView (YosemiteSDK)
 - (void)setPressureConfiguration:(NSPressureConfiguration*)aConfiguration;
 @end
 
 #endif  // MAC_OS_X_VERSION_10_10
 
 // ----------------------------------------------------------------------------
 // Chrome uses -[CWNetwork securityMode] and -[CWNetwork rssi] on OSX 10.6. The
 // former method relies on the enum CWSecurityMode which was removed in the OSX
 // 10.9 SDK. In order for Chrome to compile against an OSX 10.9+ SDK, Chrome
@@ skipping 25 matching lines @@
 // The symbol for kCWSSIDDidChangeNotification is available in the
 // CoreWLAN.framework for OSX versions 10.6 through 10.10. The symbol is not
 // declared in the OSX 10.9+ SDK, so when compiling against an OSX 10.9+ SDK,
 // declare the symbol.
 // ----------------------------------------------------------------------------
 #if defined(MAC_OS_X_VERSION_10_9) && \
     MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_9
 BASE_EXPORT extern "C" NSString* const kCWSSIDDidChangeNotification;
 #endif
 #endif  // BASE_MAC_SDK_FORWARD_DECLARATIONS_H_